formation of the universe the big bang theory. the big bang all matter & energy in the universe...
TRANSCRIPT
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Formation of the Universe
The Big Bang Theory
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The Big Bang
All matter & energy in the universe was compressed into a tiny volume
13.7 billion years ago, all the matter & energy began expanding outward
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Evidence
Discuss with your partner:What evidence do scientists have
that supports the Big Bang Theory?
Name at least 2 things
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Evidence
There are two things that scientists use as evidence:
Red Shifts
Cosmic Background Radiation
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Red Shift & the Doppler Effect
Close your eyes and imagine you are standing on a street corner. An ambulance is headed towards youWhat do the sirens sound like?
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Red Shift & Doppler Effect
Doppler Effect: an observed change in the frequency of a wave when the source or observer is moving.Ex: The abulance is the source, and when it moves past us, the frequency of the sound waves change.The same thing can happen with light waves.
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Doppler Effect Movie Clip
http://www.youtube.com/watch?v=imoxDcn2Sgo
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Hubble & Star Spectra
When the astronomer Edwin Hubble looked at the spectra of stars, he noticed a shift.What did the shift look like?The Red shift that he observed showed that the stars and galaxies were moving away.
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Star Spectra-Red Shift
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Evidence #2: Cosmic Background Radiation
CBR: radiation uniformly detected from every direction in space
Radiation in the form of radio waves
First detected in 1965 Formed shortly after the Big Bang
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Cosmic Background Radiation
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Temperature of CBR
Temperature of the radiation is VERY cold, -273°CIf the Universe was VERY HOT after the Big Bang, and takes a very long time to cool, what does this temperature indicate about the age of the universe?
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Expanding Universe
Do you think the universe expands at a constant rate?Do all parts of the universe move away from each other evenly?