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![]() Everything Gathers![]() Lots And Lots Of StarsGalaxies aren't just a few hundred or a thousand stars working together. Some are made up of tens of millions of stars and systems. It is amazing that with all of these pieces, they only tend to form a few shapes. As galaxies spin, they form either spiral or elliptical shapes. Astronomers think that the elliptical galaxies are older than the spiral ones. There are also variations of each type. The Milky Way is currently thought to be a barred-spiral galaxy. That means we have a densely packed stellar bar in the middle of our spiral.![]() |
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Useful Reference MaterialsEncyclopedia.com (Hubble's Law):http://www.encyclopedia.com/topic/Hubbles_law.aspx Wikipedia: http://en.wikipedia.org/wiki/Galaxy_formation_and_evolution Encyclopædia Britannica (Evolution of Galaxies): http://www.britannica.com/EBchecked/topic/223818/galaxy/68152/Evolution-of-galaxies-and-quasars University of Arizona (Galaxy Distances): http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxydist.htm CalTech: http://ned.ipac.caltech.edu/level5/Sept01/Bahcall2/frames.html NASA (Galaxy Evolution): http://www.nasa.gov/topics/universe/features/galaxy-evol.html University of Tennessee (Galaxy Evolution): http://csep10.phys.utk.edu/astr162/lect/galaxies/evolution.html | ||||||||||||||||||
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