what is a milky way

7/29/2019 What is a milky way

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What is a milky

way?

What is

milky

way?
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The milky way galaxy, commonly referred

to as just the milky way, sometimes simply as

the galaxy. It is came from the latin word

means in turn translated from the

Greek Galaxias, referring to the pale of life

formed by stars in the galactic plane as seen

from Earth.

Via Lactae
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It is a vast collection of more

than 200 billion stars, planets,

nebulae, clusters, dust and gas.Our own sun and solar system are

also part of the Milky Way

galaxy.
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History
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As Aristotle (384-322 BC) informs us

in Meteorologica (DK 59 A80), the Greek

philosophers Anaxagoras (ca. 500428 BC)

and Democritus (450370 BC) proposed the

Milky Way might consist of distant stars.

However, Aristotle himself believed the Milky

Way to be caused by "the ignition of the fiery

exhalation of some stars which were large,

numerous and close together" and that the

"ignition takes place in the upper part ofthe atmosphere, in the region of the world

which is continuous with the heavenly motions.
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The Arabian astronomer, Alhazen (965-1037 AD), refuted this by making the first

attempt at observing and measuring theMilky Way's parallax,and he thus

"determined that because the Milky Way hadno parallax, it was very remote fromthe earth and did not belong to theatmosphere."
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The Persian astronomer Ab Rayhn al-

Brn (973-1048) proposed the MilkyWay galaxy to be a collection of countless

nebulous stars.

The Andalusian astronomer Avempaceproposed the Milky Way to be made up of many

stars but appears to be a continuous image due

to the effect of refraction in the Earth's

atmosphere.
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Persian_peoplehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Galaxyhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Nebulahttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Al-Andalushttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Ibn_Bajjahhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Refractionhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Earth's_atmospherehttp://en.wikipedia.org/wiki/Earth's_atmospherehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Earth's_atmospherehttp://en.wikipedia.org/wiki/Earth's_atmospherehttp://en.wikipedia.org/wiki/Earth's_atmospherehttp://en.wikipedia.org/wiki/Refractionhttp://en.wikipedia.org/wiki/Ibn_Bajjahhttp://en.wikipedia.org/wiki/Al-Andalushttp://en.wikipedia.org/wiki/Nebulahttp://en.wikipedia.org/wiki/Galaxyhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Ab%C5%AB_Rayh%C4%81n_al-B%C4%ABr%C5%ABn%C4%ABhttp://en.wikipedia.org/wiki/Persian_peoplehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=epPHru--HudNZM:&imgrefurl=http://apod.nasa.gov/apod/ap080503.html&imgurl=http://apod.nasa.gov/apod/image/0805/DamavandMilkyWayPanS_tafreshi.jpg&w=2178&h=550&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


10/28

Actual proof of the Milky Way consisting of many

stars came in 1610 when Galileo Galilei used

a telescope to study the Milky Way and discovered

that it was composed of a huge number of faint stars.
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Galileo_Galileihttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Optical_telescopehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Optical_telescopehttp://en.wikipedia.org/wiki/Galileo_Galileihttp://en.wikipedia.org/wiki/Galileo_Galileihttp://en.wikipedia.org/wiki/Galileo_Galileihttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=G5ZS0uier3UPrM:&imgrefurl=http://www.astropix.com/HTML/SHOW_DIG/Milky_Way_Cherry_Springs.HTM&imgurl=http://www.astropix.com/IMAGES/SHOW_DIG/Milky_Way_Cherry_Springs.JPG&w=827&h=551&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=tR2Uo-Qijm5K8M:&imgrefurl=http://ngweiyang.wordpress.com/&imgurl=http://ngweiyang.files.wordpress.com/2011/01/07-ng-the-milky-way.jpg&w=6000&h=3887&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


11/28

Facts

about

Milky Way
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=tR2Uo-Qijm5K8M:&imgrefurl=http://ngweiyang.wordpress.com/&imgurl=http://ngweiyang.files.wordpress.com/2011/01/07-ng-the-milky-way.jpg&w=6000&h=3887&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=tR2Uo-Qijm5K8M:&imgrefurl=http://ngweiyang.wordpress.com/&imgurl=http://ngweiyang.files.wordpress.com/2011/01/07-ng-the-milky-way.jpg&w=6000&h=3887&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=tR2Uo-Qijm5K8M:&imgrefurl=http://ngweiyang.wordpress.com/&imgurl=http://ngweiyang.files.wordpress.com/2011/01/07-ng-the-milky-way.jpg&w=6000&h=3887&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=tR2Uo-Qijm5K8M:&imgrefurl=http://ngweiyang.wordpress.com/&imgurl=http://ngweiyang.files.wordpress.com/2011/01/07-ng-the-milky-way.jpg&w=6000&h=3887&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1


12/28

As a galaxy, the Milky Way is actually a

giant, as its mass is probably between 750 billion

and one trillion solar masses, and its diameter is

about 100,000 light years. Radio astronomial

investigations of the distribution of hydrogen

clouds have revealed that the Milky Way is a spiral

galaxy of Hubble type Sb or Sc. Therefore, our

galaxy has both a pronounced disk component

exhibiting a spiral structure, and a prominent

nuclear reagion which is part of a notable

bulge/halo component. Decade-long observationshave brought up more and more evidence that the

Milky Way may also have a bar structure (so that it

would be type SB).
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://seds.org/messier/spir.htmlhttp://seds.org/messier/spir.htmlhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://seds.org/messier/spir.htmlhttp://seds.org/messier/spir.htmlhttp://seds.org/messier/spir.htmlhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=oq4I5gxcoWMGdM:&imgrefurl=http://www.windows2universe.org/mythology/Maya_Milkyway.html&imgurl=http://www.windows2universe.org/the_universe/images/milky_way_top_sm2.jpg&w=246&h=246&ei=f-yaTYXsBMLXcfvUvdoF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=UNpbgEJ2yXGBXM:&imgrefurl=http://casswww.ucsd.edu/public/tutorial/MW.html&imgurl=http://casswww.ucsd.edu/public/tutorial/images/mw.jpg&w=418&h=653&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1


13/28

Size
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=UNpbgEJ2yXGBXM:&imgrefurl=http://casswww.ucsd.edu/public/tutorial/MW.html&imgurl=http://casswww.ucsd.edu/public/tutorial/images/mw.jpg&w=418&h=653&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=UNpbgEJ2yXGBXM:&imgrefurl=http://casswww.ucsd.edu/public/tutorial/MW.html&imgurl=http://casswww.ucsd.edu/public/tutorial/images/mw.jpg&w=418&h=653&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=UNpbgEJ2yXGBXM:&imgrefurl=http://casswww.ucsd.edu/public/tutorial/MW.html&imgurl=http://casswww.ucsd.edu/public/tutorial/images/mw.jpg&w=418&h=653&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=UNpbgEJ2yXGBXM:&imgrefurl=http://casswww.ucsd.edu/public/tutorial/MW.html&imgurl=http://casswww.ucsd.edu/public/tutorial/images/mw.jpg&w=418&h=653&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1


14/28

The stellar disk of the Milky Way galaxy is

approximately 100,000 light-years (30 kiloparsecs,91017 km) in diameter, and is considered to be, on

average, about 1,000 ly (0.3 kpc) thick. It is estimated

to contain at least 100 billion stars and possibly up to

400 billion stars, the exact figure depending on thenumber of very low-mass, or dwarf star, which are hard

to detect, especially more than 300 ly (90 pc) from our

sun, and so current estimates of the total number

remain highly uncertain.
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=1vKKzRcrbO8m-M:&imgrefurl=http://viewzone2.com/milkyway.html&imgurl=http://viewzone2.com/milkyway1.jpg&w=630&h=473&ei=d-yaTb6oLYX5cbDOtNgF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=rEPcFI_A7OsSfM:&imgrefurl=http://www.noao.edu/image_gallery/html/im1038.html&imgurl=http://www.noao.edu/image_gallery/images/d2/milky-way-tololo-1800.jpg&w=1800&h=2700&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


15/28

AGE
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=rEPcFI_A7OsSfM:&imgrefurl=http://www.noao.edu/image_gallery/html/im1038.html&imgurl=http://www.noao.edu/image_gallery/images/d2/milky-way-tololo-1800.jpg&w=1800&h=2700&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=rEPcFI_A7OsSfM:&imgrefurl=http://www.noao.edu/image_gallery/html/im1038.html&imgurl=http://www.noao.edu/image_gallery/images/d2/milky-way-tololo-1800.jpg&w=1800&h=2700&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=rEPcFI_A7OsSfM:&imgrefurl=http://www.noao.edu/image_gallery/html/im1038.html&imgurl=http://www.noao.edu/image_gallery/images/d2/milky-way-tololo-1800.jpg&w=1800&h=2700&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=rEPcFI_A7OsSfM:&imgrefurl=http://www.noao.edu/image_gallery/html/im1038.html&imgurl=http://www.noao.edu/image_gallery/images/d2/milky-way-tololo-1800.jpg&w=1800&h=2700&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


16/28

In 2007, a star in the Galactic halo, HE 1523-0901, was

estimated to be about 13.2 billion years old, nearly as old as

the Universe. As the oldest known object in the Milky Wayat that time, it placed a lower limit on the age of the MilkyWay.This estimate was determined using the UV-VisualEchelle Spectrograph of the Very Large

Telescope tomeasure the relative strengths of spectrallines caused by the presence of Thorium andother elements created by the R-process. The linestrengths yield abundances of different

elemental isotopes, from which an estimate of the age ofthe star can be derived using nucleocosmochronology.
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/HE_1523-0901http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Age_of_the_universehttp://en.wikipedia.org/wiki/Age_of_the_universehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Very_Large_Telescopehttp://en.wikipedia.org/wiki/Very_Large_Telescopehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Measurementhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Spectral_linehttp://en.wikipedia.org/wiki/Spectral_linehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Thoriumhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Chemical_elementhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/R-processhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Isotopehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Nucleocosmochronologyhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Nucleocosmochronologyhttp://en.wikipedia.org/wiki/Isotopehttp://en.wikipedia.org/wiki/R-processhttp://en.wikipedia.org/wiki/R-processhttp://en.wikipedia.org/wiki/R-processhttp://en.wikipedia.org/wiki/Chemical_elementhttp://en.wikipedia.org/wiki/Thoriumhttp://en.wikipedia.org/wiki/Spectral_linehttp://en.wikipedia.org/wiki/Spectral_linehttp://en.wikipedia.org/wiki/Measurementhttp://en.wikipedia.org/wiki/Very_Large_Telescopehttp://en.wikipedia.org/wiki/Very_Large_Telescopehttp://en.wikipedia.org/wiki/Age_of_the_universehttp://en.wikipedia.org/wiki/Age_of_the_universehttp://en.wikipedia.org/wiki/HE_1523-0901http://en.wikipedia.org/wiki/HE_1523-0901http://en.wikipedia.org/wiki/HE_1523-0901http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=4ao3y1f8JxKnjM:&imgrefurl=http://www.therealityofthesituation.com/gallery.php?id=&page=35&gallery=Space&imgurl=http://www.therealityofthesituation.com/image/Hubble/full_milky_way.jpg&w=1739&h=1149&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=YAXVa8sV1BGraM:&imgrefurl=http://universe-review.ca/F05-galaxy.htm&imgurl=http://universe-review.ca/I05-25-MW.jpg&w=395&h=450&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


17/28

Composition

andStructure
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=YAXVa8sV1BGraM:&imgrefurl=http://universe-review.ca/F05-galaxy.htm&imgurl=http://universe-review.ca/I05-25-MW.jpg&w=395&h=450&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=YAXVa8sV1BGraM:&imgrefurl=http://universe-review.ca/F05-galaxy.htm&imgurl=http://universe-review.ca/I05-25-MW.jpg&w=395&h=450&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=YAXVa8sV1BGraM:&imgrefurl=http://universe-review.ca/F05-galaxy.htm&imgurl=http://universe-review.ca/I05-25-MW.jpg&w=395&h=450&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=YAXVa8sV1BGraM:&imgrefurl=http://universe-review.ca/F05-galaxy.htm&imgurl=http://universe-review.ca/I05-25-MW.jpg&w=395&h=450&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


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The galaxy consists of a bar-shaped core region

surrounded by a disk ofgas, dust and stars forming four

distinct arm structures spiraling outward in a logarithmic

spiral shape. The mass distribution within the galaxy closely

resembles the Sbc Hubble classification, which is a spiral

galaxy with relatively loosely wound arms.Astronomers first

began to suspect that the Milky Way is a barred spiral galaxy,

rather than an ordinary spiral galaxy, in the 1990s. Their

suspicions were confirmed by the Spitzer Space

Telescope observations in 2005 that showed the galaxy's

central bar to be larger than previously suspected.Estimates for the mass of the Milky Way vary, depending upon

the method and data used.
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Interstellar_mediumhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Logarithmic_spiralhttp://en.wikipedia.org/wiki/Logarithmic_spiralhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Galaxy_morphological_classificationhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Barred_spiral_galaxyhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Spiral_galaxyhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Spitzer_Space_Telescopehttp://en.wikipedia.org/wiki/Spitzer_Space_Telescopehttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://en.wikipedia.org/wiki/Spitzer_Space_Telescopehttp://en.wikipedia.org/wiki/Spitzer_Space_Telescopehttp://en.wikipedia.org/wiki/Spiral_galaxyhttp://en.wikipedia.org/wiki/Barred_spiral_galaxyhttp://en.wikipedia.org/wiki/Galaxy_morphological_classificationhttp://en.wikipedia.org/wiki/Logarithmic_spiralhttp://en.wikipedia.org/wiki/Logarithmic_spiralhttp://en.wikipedia.org/wiki/Interstellar_mediumhttp://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=pTaVt9TerdJIjM:&imgrefurl=http://www.spacetoday.org/Questions/MilkyWayExplained.html&imgurl=http://www.spacetoday.org/images/Questions/MilkyWayGalaxyNASA.jpg&w=326&h=254&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


19/28
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=0Rtwncgimv_yWM:&imgrefurl=http://map.gsfc.nasa.gov/universe/rel_milkyway.html&imgurl=http://map.gsfc.nasa.gov/media/ContentMedia/dirbe123_2p6dec.jpg&w=1024&h=512&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


20/28

GalacticCenter
http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=0Rtwncgimv_yWM:&imgrefurl=http://map.gsfc.nasa.gov/universe/rel_milkyway.html&imgurl=http://map.gsfc.nasa.gov/media/ContentMedia/dirbe123_2p6dec.jpg&w=1024&h=512&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=0Rtwncgimv_yWM:&imgrefurl=http://map.gsfc.nasa.gov/universe/rel_milkyway.html&imgurl=http://map.gsfc.nasa.gov/media/ContentMedia/dirbe123_2p6dec.jpg&w=1024&h=512&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=0Rtwncgimv_yWM:&imgrefurl=http://map.gsfc.nasa.gov/universe/rel_milkyway.html&imgurl=http://map.gsfc.nasa.gov/media/ContentMedia/dirbe123_2p6dec.jpg&w=1024&h=512&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=0Rtwncgimv_yWM:&imgrefurl=http://map.gsfc.nasa.gov/universe/rel_milkyway.html&imgurl=http://map.gsfc.nasa.gov/media/ContentMedia/dirbe123_2p6dec.jpg&w=1024&h=512&ei=eeyaTcSgNtOccaWTwNEF&zoom=1http://www.google.com.ph/imgres?q=milky+way&hl=tl&sa=X&biw=1366&bih=677&tbm=isch&prmd=ivns&tbnid=S6cXPoSJWfCA4M:&imgrefurl=http://www.public.asu.edu/~rjansen/localgroup/localgroup.html&imgurl=http://www.public.asu.edu/~rjansen/localgroup/MW_Lund_big.gif&w=1011&h=545&ei=eeyaTcSgNtOccaWTwNEF&zoom=1


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The galactic disc, which bulges outward at the galactic

center, has a diameter of 70,000100,000 light-years (2030

kpc). The exact distance from the Sun to the galactic center is

actively debated. The latest estimates from geometric-based

methods and standard candles yield distances to the Galactic

center of 7.68.7 kpc (25,00028,000 ly).The fact that the

estimates span over 1 kpc only underscores the true uncertainty

associated with the distance to the Galactic center.The galactic center harbors a compact object of very large mass

as determined by the motion of material around the center. The

intense radio source named Sagittarius A*, thought to mark the

center of the Milky Way, is newly confirmed to bea supermassive black hole. Most galaxies are believed to have a

supermassive black hole at their center.
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what is a milky way

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