Galaxy Review

• Astronomers estimate that the universe contains

• 100 galaxies• 100 million galaxies• 100 billion galaxies• 100 trillion galaxies

• 100 billion galaxies

• Clusters of galaxies form larger groups called

• Supernovas• Superclusters• Constellations• Supergiants

• Superclusters

• Quasars are thought to be the centers of

• Distant nebulas• Distant constellations• Distant galaxies• Distant clusters

• Distant galaxies

• Quasars were named for their

• Absorption of radiation• Generation of radiation• Resemblance to galaxies• Resemblance to stars

• Resemblance to stars

• Astronomers group galaxies based on their

• Shape • Size• Colors• ages

• shape

• Quasars are among the strongest sources of ____________ in the universe.

• Planets• Sound waves• Radio waves• microwaves

• Radio waves

• Our galaxy is classified as a

• Spiral• Elliptical• Irregular• peculiar

• spiral

• The universe is made up of mostly

• Dark matter• Dark energy• Stars• Empty space

• Empty space

• The number of universes known to exist is

• One • One hundred• One million• One billion

• one

• ______________ block the view of the center of the Milky Way.

• Stars and moons• Blackholes• Gas and dust• Planets and stars

• Gas and dust

• The name of the galaxy cluster that the Milky Way belongs to is the

• Virgo Cluster• Local Group• Inner Group• Virgo Super Cluster

• Local Group

• Our solar system is located in the _____ Arm the Milky Way Galaxy.

• Centarus• Perseus• Sagittarius• Orion

• Orion

• Which answer best describes the disk of a galaxy?

• Mostly older stars, not much gas and dust.• Mostly older stars, lots of gas and dust.• Mostly younger stars, not much gas and dust.• Mostly younger stars, lots of gas and dust.

• Mostly younger stars, lots of gas and dust.

• Which answer best describes the bulge of a galaxy?

• Made up of old stars in galactic clusters.• Made up of old stars in globular clusters.• Made up of young stars in galactic clusters.• Made up of young stars in globular clusters.

• Made up of old stars in globular clusters.

http://images.google.com/imgres?imgurl=http://www.nrc-cnrc.gc.ca/education/images/cdnskies/photos/spiral-galaxy.jpg&imgrefurl=http://www.nrc-cnrc.gc.ca/education/cs-gallery_e.html&h=169&w=180&sz=16&tbnid=6jZVq2t7zR8a-M:&tbnh=90&tbnw=96&hl=en&start=6&prev=/images%3Fq%3Dspiral%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D

• spiral

http://images.google.com/imgres?imgurl=http://csep10.phys.utk.edu/astr162/lect/galaxies/m87.gif&imgrefurl=http://csep10.phys.utk.edu/astr162/lect/galaxies/elliptical.html&h=278&w=245&sz=30&tbnid=gUQxPVgZR2CsAM:&tbnh=109&tbnw=96&hl=en&start=1&prev=/images%3Fq%3Delliptical%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• elliptical

http://images.google.com/imgres?imgurl=http://www.astro.lsa.umich.edu/sas/cosmology_inreach/wierd.gif&imgrefurl=http://www.astro.lsa.umich.edu/sas/cosmology_inreach/galaxiesandcosmology.html&h=274&w=290&sz=38&tbnid=S74SEaf5-icHcM:&tbnh=103&tbnw=110&hl=en&start=10&prev=/images%3Fq%3Dirregular%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• irregular

http://images.google.com/imgres?imgurl=http://www.ucolick.org/~egates/Images/m102.jpg&imgrefurl=http://www.ucolick.org/~egates/&h=1024&w=974&sz=57&tbnid=o2On4t2gPqfkhM:&tbnh=150&tbnw=142&hl=en&start=12&prev=/images%3Fq%3Dspiral%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D

• spiral

http://images.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg/350px-Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg&imgrefurl=http://en.wikipedia.org/wiki/Barred_spiral_galaxies&h=199&w=348&sz=53&tbnid=xC6-QAqB8_-AEM:&tbnh=66&tbnw=116&hl=en&start=17&prev=/images%3Fq%3Dspiral%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D

• spiral

http://images.google.com/imgres?imgurl=http://antwrp.gsfc.nasa.gov/apod/image/0201/ngc6822_noao_big.jpg&imgrefurl=http://antwrp.gsfc.nasa.gov/apod/ap020123.html&h=1058&w=1024&sz=314&tbnid=TscjLTxD-IyqJM:&tbnh=150&tbnw=145&hl=en&start=19&prev=/images%3Fq%3Dirregular%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• irregular

http://images.google.com/imgres?imgurl=http://www.noao.edu/image_gallery/images/d5/m89.jpg&imgrefurl=http://www.noao.edu/image_gallery/html/im0572.html&h=700&w=700&sz=36&tbnid=Y5ARzqN6f-2tyM:&tbnh=138&tbnw=138&hl=en&start=7&prev=/images%3Fq%3Delliptical%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• elliptical

http://images.google.com/imgres?imgurl=http://www.geocities.com/astronomyprojecttour/irregular.jpg&imgrefurl=http://www.geocities.com/astronomyprojecttour/galaxies.htm&h=248&w=261&sz=27&tbnid=n11eEr0bzbqy7M:&tbnh=101&tbnw=107&hl=en&start=4&prev=/images%3Fq%3Dirregular%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• irregular

http://images.google.com/imgres?imgurl=http://www.le.ac.uk/physics/faulkes/web/images/elliptical.jpg&imgrefurl=http://www.le.ac.uk/physics/faulkes/web/galaxies/y_ga_elliptical.html&h=318&w=316&sz=29&tbnid=hAFPh9WHn2KCYM:&tbnh=113&tbnw=112&hl=en&start=18&prev=/images%3Fq%3Delliptical%2Bgalaxies%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

• elliptical

http://images.google.com/imgres?imgurl=http://www.jesus-is-savior.com/Basics/spiral_galaxies.gif&imgrefurl=http://www.jesus-is-savior.com/Basics/god_is_amazing.htm&h=531&w=662&sz=224&tbnid=4ooN4CjYrDdohM:&tbnh=109&tbnw=136&hl=en&start=33&prev=/images%3Fq%3Dspiral%2Bgalaxies%26start%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN

• spiral