the big bang · 215.notebook 1 june 02, 2014 jun 27:32 am 215 history of the universe how long has...
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215.notebook
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June 02, 2014
Jun 27:32 AM
215 History of the Universe
How long has the light traveled from the Andromeda Galaxy?
2 million years
Jun 27:34 AM
What have astronomers inferred from observing galaxies that are billions of light year away
• Light has been traveling for billions of years therefore the universe must be billions of years old
Jun 27:34 AM
How do astronomers study how and when the universe formed?• They observe how galaxies move
Jun 27:35 AM
What two things can astronomers learn by examining the spectrum of a galaxy?How fast it is moving and if it is moving toward or away from us
• The farther away a galaxy is from us, the faster it is moving away from us.
• Space is expanding expanding space
Jun 27:35 AM
The Big Bang• The universe began as a small, hot, dense point• It formed as a result of an explosion and has been expanding ever since then
https://www.youtube.com/watch?v=lhTSfOZUNLo
Jun 27:37 AM
215.notebook
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June 02, 2014
Jun 27:37 AM
Formation of the Solar System• 1st Nebula of dust and gas• 2nd Nebula began to spin• 3rd Atoms collected in the center• 4th Fusion began• 5th Gases boiled away on inner planets• 6th Outer planets became the gas giants• 7th Comets, made of ice and dust formed at the edges of the solar system.
Jun 27:38 AM
What will happen in the future?
• Universe will continue to expand till it runs out of fuel
• Gravity will cause universe to shrink
• No one knows for sure what will happen.
Jun 29:12 AM