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15 Cards in this Set
- Front
- Back
How old is the Universe?
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Between 12-15 billion years
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How old is our sun?
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5 billion years.
1/2 its lifespan |
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How old is the earth?
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4.6 billion years
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When did life appear?
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Between 3.5-4 billion years ago
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How old are the oldest known rocks?
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3.8 Billion
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Oldest rocks from the ocean are how old?
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200 million years
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Which generation star is the sun?
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Second generation
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Who was the first person to catalog galaxies
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Hubble
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What is the Red shift?
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Based on the doppler effect
The amount of shift indicates the rate of movement large=high velocity small= lower velocity Red=moving away Blue=coming towards us Discovered by Hubble in 1929 |
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What do stars fuse together?
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hydrogen and helium during FUSION
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Stars vary in size and color depending on:
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How much hydrogen fuel they have (a fixed amount)
AND How quickly they burn that fuel |
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Stellar Brightness is controlled by:
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Size
Temperature Distance |
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Hot stars
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Temp: 30,000k+
Rapid rate of Fusion Short wave length--appear blue short lifespan |
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Cool stars
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Temp: <3,000k
Slow rate of Fusion Long wave length--appears red long lifespan: 20+ billion years |
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Our Sun
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Medium star
appears yellow 5 billion years old--1/2 way through hydrogen supply 2nd generation |