The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed...
Transcript of The UNIVERSE has BILLIONS of Galaxies We are in the Milky ......Expanding dust and gases condensed...
Astronomy 2015.notebook
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The UNIVERSE has BILLIONS of Galaxies
Galaxies: Clusters of stars We are in the Milky Way Galaxy Spiral Galaxy About 120,000 light years in diameter
https://www.youtube.com/watch?v=NCweccNOaqo
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Distances in space:
LightYear: Amount of distance light travels in one year, about 9.5 trillion kilometers
Our Sun: 8 lightminutes away
Nearest neighbor star: 4.3 light years away
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STAR FORMATION:
Red Star (young) Reaction causes hydrogen to change to helium, releasing energy in light and heat.Color changes to orange, yellow or white. Then stabilizes.
Our Sun, average size yellow star. When hydrogen used up: Star collapses
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Solar System:
Big Bang Theory:Universe created 1015 billion years ago Violent expansion of mattrer and energy.
Expanding dust and gases condensed to form galaxies filled with stars.
5 Billion years ago, dense area became our sun.
Soon, other material condensed into planets, moons, etc.
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The biggest and the smallest 45 minhttps://www.youtube.com/watch?v=zVR106sznNw