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16 Cards in this Set
- Front
- Back
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irregular galaxy
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a galaxy that has a chaotic appearance, large clouds of gas and dust, and no spiral arms.
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nova
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the sudden brightening of a white dwarf caused by the explosion of accumulated hydrogen gas on its surface
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spiral galaxy
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a disk shaped galaxy containing hot, bright stars and spiral arms, our milky way galaxy is a spiral galaxy
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white dwarf
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a dying star that has collapsed to the size of the earth and is slowling cooling off; located at lower left of the H-R diagram
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protostar
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the aggregation of matter that goes into and precedes the formation of a star.
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planetary nebula
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an expanding shell of gas ejected from a low mass star during the latter stages of its evolution
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binary
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a system of two stars that orbit about a common center of mass
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neutron star
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a small, dense star composed of tightly packed neutrons formed by the welding together of protons and electrons
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cluster
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a grouping of more than one galaxy
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galaxy
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a large assembly of stars, numbering in the hundreds of millions to hundreds of billions, together with gas, dust, and other materials, all held together by the forces of mutual gravitation
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red giant
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a cool giant star above main sequence on the HR diagram
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big bang
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the primordial explosion of space at the beginning of time
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elliptical galaxy
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a galaxy that is round or elliptical in outline. It contains little gas and dust, no disk or spiral arms, and few hot, bright stars.
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pulsar
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a neutron star that spins rapidly and in doing so sends out short, precisely timed bursts of electromagnetic radiation.
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supercluster
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a grouping of an enormous number of galaxies
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supernova
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one of natures most spectacular events
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