Download - Chapter 9 Stars and Galaxies
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CHAPTER 9 :
STARS ANDGALAXIES
Prepared by :
Pn. Noor Hazwani bt.Alias
SMK Sg.Maong,Kuching
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The Sun
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The Sun
- Shape like a ball.
- Made up of hot gases : hydrogen and helium
- Surface temperature : 5 500 - 6 000 oC
- The Sun is one ofthe many billions ofstars.
- Nearest starto Earth. That is why it appears bigger and brighter
than other stars.
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Has three layers
Structure of the Sun
Corona Chromosphere
Photosphere
can only be seen clearly
during solar eclipse.
can be seen clearlyeveryday
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Solar eclipse
Corona and Chromosphere
can only be seen during solar eclipse.
CoronaChromosphere
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Phenomena on The Surface of The Sun
Prominence-arches or loops shape.
-eruption of chromosphere
(2nd layer)
Solar flare- explosion near sunspots
- release charged
particles into outer space.
(Examples:
* Electrons,
* X-rays,
* Ultraviolet rays)
Sunspot- cool spot
- eruption of
photosphere
(1st layer)
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Aurora Dazzling,colourful light.
Occur at north pole and south pole of Earth. Charged particles interact with Earths magnetic
field.
Solar flare
-release charged particles
(Examples:
* Electrons, * X-rays, * Ultraviolet rays)
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How the Sun produces energy?
Nuclear reaction (in the core)
4 hydrogen atoms 1 helium atom + light energy + heat energy
+Light and
heat energ
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Various types of Star
Size
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Temperature and colour
Various types of Star
Blue
Hottest star
Yellow
Mediumtemperature
Red
Coolest
star
Colour Temperature Example:
Blue 40 000 0C Spica
Bluish-
white
10 000 0C Rigel
Yellow 6 000 0C The Sun
Red 3 000 0C Betelgeuse
Medium
temperature
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Brightness.
Various types of Star
Rigel
Sirius
Sirius
Rigel
ProcyonAchernar
5 brightest star
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Formation of Stars
Gases
(hydrogen)
Dusts
A
nebula
A core is
formed.
-very hot and
dense
-The core
becomes hotter.
- Nuclear
reactions take
place.
A STAR IS
FORMED !!
1.
*Nuclear reaction (in the core) 4 hydrogen atoms 1 helium atom + light energy + heat energy
3.
2.
Gases anddusts in a
nebula are
pulled by
strong
gravity
forces untilit become
compact
(dense).
http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=RLHWTHLjHwb-GM&tbnid=ZEfcyrkdOpk6CM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.spaceref.com%2Fnews%2Fviewpr.html%3Fpid%3D36410&ei=4ufLUZnJMseMrQfz4IHoDQ&bvm=bv.48340889,d.bmk&psig=AFQjCNFaEFhRwV8w209FfGH3b18SzAFwkA&ust=1372403996200682 -
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Death of Star*depends on the size of the star
Nebula
http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126 -
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Death of Star*medium size star, such as The Sun
2. *gravity pull weakens.
*the star expands
and forms red giant.
1. *Hydrogen atoms
in the star are all
used up.
* Nuclear reaction stops.
3. *Substance at the outer
part of the star
escape to outer space.
4. *A white core or
a white dwarf is
formed.
Medium size star
Black Dwarf
http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69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Death of Star*large star and super large star
star
* DEATH OF LARGE
STAR
(10 x Suns mass)
* DEATH OF
SUPER
LARGE STAR
(100 x Suns
mass)
1. *Hydrogen atoms
in the star are all
used up.
* Nuclear reaction stops.
2. * Gravity pull weakens.
* The star expandsand forms red giant.
* The red giant continue to
expand to form red
supergiant.
3. *Red supergiant
explodes.
*The explosion is
known as supernova.
Nebula
Neutron star :
*consists of neutrons.
*rotates and gives out radio
waves.
Black Hole:
*cannot be seen.
*dense.
*has very strong gravity force.
http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69EedDMJOjr4Dc7sgtKMA&ust=1372407922290126http://www.google.com.my/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=x9N1fcl0Ns1MFM&tbnid=ukHjzaE43vAnRM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.gamasutra.com%2Fblogs%2FSebastianAlvarado%2F20120706%2F173700%2FThe_Evolution_of_Stars_Exploring_the_fiction_behind_Mass_effect_Halo_and_Starcraft_2.php&ei=QvfLUbSAJMrHrQegy4CYCg&bvm=bv.48340889,d.bmk&psig=AFQjCNFHY9GUL69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Constellation A group of stars arranged in specific pattern.
In the past, constellation were used as :
a) compass (to show direction).
b) calender
Aconstellation
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Constellation
North
Big dipper
Examples :
South
North
Southern
cross
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Universe and Galaxies
Universe
Galaxies
Solar System
Earth
Human being
Milky Way
(our galaxy)
*Notes
The Universe :-a very huge space
-holds everything from
the smallest particle to
the largest galaxy.
-there are billions of
galaxies in the Universe.
Galaxy :
-Each galaxy has billions
of stars.
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Hubble Space Telescope-is used to observe galaxies
http://en.wikipedia.org/wiki/Hubble_Space_Telescopehttp://en.wikipedia.org/wiki/Hubble_Space_Telescope -
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Galaxies
Spiral galaxy Irregular galaxy
(no obvious shape)
Elliptical galaxy
(oval shape)
- A galaxy contains billions of stars.
- Has many shapes.
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Our Galaxy : The Milky Way
Spiral shape