11 - • Found by accident by Penzias and Wilson in 1970...

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Lecture 1/26/11 The History of the Universe The Big Bang When the universe was born there was no carbon or oxygen in existence Temperature was too hot and matter was in a form of “atomic parts”: protons and neutrons As the universe expanded the initial soup began to cool and formed simple atoms mostly H and He About 1 minute after the birth of universe Next? Fluctuations in primordial soup The dark ages: gravity slowly wins: forming giant clouds of hydrogen gass The age of illumination: first stars Galaxy Formation: islands of stars How Do We Know This? Recall-- observing more distant objects means we are looking back in time! In every direction we look we see radiation that has a characteristic temperature: 2.7 K
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Unformatted text preview: • Found by accident by Penzias and Wilson in 1970 • Nearly every galaxy is moving away from us • More distant ones appear to be moving faster • Temperature and motion predicted in Big Bang Theory How Can We Tell This? • The Doppler Effect • The universe has no center and no edge as far as we can tell How do we know the age of the Universe? • Radioactive dating of elements • Very precise measurement, but requires knowledge of galaxy evolution, so its uncertain • age is 11.5- 17.7 Byr • Ages of the oldest stars • 10-15 Byr • Looking for the most distant objects (oldest) we can detect in the universe • ~14 Byr • From cosmological models • current accepted value is 14 Byr...
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This note was uploaded on 03/14/2011 for the course ASTRO 115 taught by Professor Bergins during the Winter '11 term at University of Michigan.

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11 - • Found by accident by Penzias and Wilson in 1970...

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