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15 Cards in this Set
- Front
- Back
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big bang theory |
the theory of the beginning of the universe in an instant, billions of years ago, in an enormous explosion |
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red shift |
a shift toward the red wavelengths of light from stars or galaxies moving away from earth |
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blue shift |
a shift towards the blue wavelengths of light from stars or galaxies moving away from earth |
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cosmic background microwave radiation |
the thermal radiation left from the big bang of cosmology |
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gas giants |
a large, massive planet that is composed mainly of hydrogen and helium |
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asteroids |
small, rocky solar system bodies, most of which are found orbiting the sun in a region between Mars and Jupiter |
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meteoroid |
a chunk of rock that moves through the solar system |
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comets |
a mass of rock, dust, and ice that partially vaporizes when it passes near the sun |
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stars |
a large, glowing ball of gas in space that generates energy through nuclear fusion in it's core |
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fusion |
a nuclear reaction in which the nuclei of two atoms to form a larger nucleus |
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nebula |
a large cloud of gas and dust spread out over a large volume of space |
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super giants |
a very large, massive, bright star ranging in size from 100 to 1000 times the diameter of the sun |
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giants |
a large, massive bright star that is somewhat smaller and fainter than a supergiant |
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main sequence |
a diagonal band on the H-R diagram, which represents about 90% of all stars |
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white dwarfs |
the small, dense, but dim remains of a low or medium mass star |
