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There was no "before" the beginning of our universe, because once upon a time there was no time. * John D. Barrow I don't pretend to understand the Universe--it's a great deal bigger than I am. * Thomas Carlyle A universe that came from nothing in the big bang will disappear into nothing at the big crunch. Its glorious few zillion years of existence not even a memory. * Paul Davies Anyone informed that the universe is expanding and contracting in pulsations of eighty billion years has a right to ask, "What's in it for me?" * Peter De Vries Nothing puzzles me more than the time and space; and yet nothing troubles me less. * Charles Lamb Quotes
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Milky Way Galaxy
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The Milky Way Galaxy: Vital Statistics
Diameter - 100,000 light years Thickness (Nucleus) - 20,000 light years Thickness (Disc) - 2,000 light years Number of Stars - 200,000,000,000 Age - 15,000,000,000 years
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The Halo
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The Disk
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The Core
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Elliptical Galaxies 1/3 of all galaxies
Giant Ellipticals are the size of our galaxy but are rare Dwarf Ellipticals are more common (6000 light yrs across) Riesen-E
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Spiral Galaxies Largest fraction of galaxies Andromeda
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Barred Spiral Galaxy NGC-1365
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Irregulars Large Magellanic Cloud
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Galaxies form groups or Clusters
Coma Cluster
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IMPORTANT Milky Way Data Galaxy Classification Galaxy Clusters
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NEXT TIME: SPECIAL THEORY
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