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24 Cards in this Set
- Front
- Back
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The rainbows of colors produced when white light passes through a prism or spectrograph |
spectrum |
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how bright a light looks or appears |
Apparent magnitude |
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the actual brightness of a star |
absolute magnitude |
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the distance that light travels in one year |
Light-year |
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an apparent shift In the position of an object when viewed from different locations |
Parallax |
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a graph showing the relationship between a star's surface temperature |
H-R diagram |
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a diagonal pattern of stars on the H-R diagram |
main sequence |
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a small, hot star near the end of its life; the leftover center of an old star |
white dwarf |
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a star that expands and cools once it runs out of hydrogen fuel |
red giant |
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the death of a large star by explosion |
supernova |
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a star in which all the particles have become neutrons; pressed-in remains of a supernova |
neutron star |
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a spinning neutron star that emits rapid pulses of light |
pulsar |
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an object with more than three solar system masses squeezed into a ball only 10 km across whose gravity is so strong that not even light can escape |
black whole |
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large groupings of starts in space |
galaxies |
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a galaxy with a bulge in the center and very distinctive spiral arms |
spiral galaxy |
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a spherical or elongated galaxy with a bright center and very little dust and gas |
elliptical galaxy |
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is a galaxy that doesn't fit into any other class and their shape is irregular |
irregular galaxy |
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clouds of gas and dust |
nebulas (nebulae) |
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are groups of older stars that looks like a ball of stars |
globular cluster |
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groups of starts that are usually located along the spiral disk of a galaxy newly formed clusters have many bright blue stars |
open clusters |
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a "quasi-stellar" object; a starlike source of light that is extremely far away; one of the most powerful sources of energy in the universe |
quasar |
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the study of the origin and future of the universe |
cosmology |
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states that the universe began with a tremendous explosion |
big bang theory |
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radiation left over from the big bang that fills all of space |
cosmic background radiation |
