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Galaxies-Fall_05-(A).pdf

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Galaxy Overview Galaxy Overview & Classification & Classification Island Universes Much of our knowledge of our own galaxy comes from studying other galaxies. There are estimated to be 100 billion other galaxies in the universe. Some are larger than the milky way, most are smaller. Even a modest size galaxy contains more stars than all the people who have ever lived. Island Universes (2) The most distant galaxies are so far away that the light we see them by left before the earth exis
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  Galaxy OverviewGalaxy Overview& Classification& Classification  Island Universes  Much of our knowledge of our own galaxy comes from studying other galaxies.  There are estimated to be 100 billion other galaxies in the universe.  Some are larger than the milky way, most are smaller.  Even a modest size galaxy contains more stars than all the people who have ever lived.  Island Universes (2)  The most distant galaxies are so far away that the light we seethem by left before the earth existed.  Mapping the galaxies astronomers have discovered the order and structure inherent to the Universe at the largest scales.  It also reminds of us of “  Kepler's fourth law ”: ‘The Universe doesn't revolve around you, ya know’!  This is actually something called the “ Copernican Principle ”: ‘We do not live in a special place or time in the Universe’.  Look-Back Time  Some galaxies are 4 to 6 billion light years away.  When we see them, we see them as they existed 4 to 6 billion years ago.  This is called the look-back time.
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