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14 Cards in this Set
- Front
- Back
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Hubble's discovery |
Edwin hubble was the first astronomer to discover other galaxies
He noticed that galaxies move away from each other |
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Hubble's proposal |
1) The universe is expanding in all directions 2) All galaxies have taken the same amount of time to reach present positions 3) Farther galaxies seem to move away at faster rate |
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Raisin Bread Analogy |
As the dough (universe) expands, the distance between all the raisins (galaxies) increases |
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Evidence of Expanding Universe |
Red shift - electromagnetic waves of galaxies get streched out and shirt toward the red end of spectrum as they travel away from galaxies |
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Big Band Theory |
13.7 billion years ago an ifintely small volume of space suddenly and rapidly expended to immense size before this there was no energy or matter ever since has been expanding and cooling |
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Evidence of Big Bang |
1) galaxies are moving away from each other 2) cosmic background rotation left over from BB first detected in 1960 by radio telescope 3) Satellites and space probs have mapped out radition |
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Galaxy |
Collection of stars, gas, and dust held together by gravity about 125 billion galaxies
Milky way has about 100 billion stars |
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Spiral Galaxy |
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Barred Galaxy |
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Ellipital Galaxy |
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Irregular Galaxy |
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Star Cluster |
group of stars found within galaxies |
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Globular Cluster |
collection of stars up to 1 million stars held together in circle shape |
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Open Cluster |
Up to ten thousands of stars |
