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10 Cards in this Set
- Front
- Back
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Star
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A fixed luminous point in the night sky that is a large, remote incandescent body like the sun. |
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Light-year
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A unit of astronomical distance equivalent to the distance that light travels in one year (9.9607) |
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Main-sequence star
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It fuses hydrogen atoms to form helium atoms in their core. These can range from about a tenth of the mass of the sun up to 200 times as massive.
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Nebula
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A cloud of dust and gas in outer space. Visible in the night sky either as a indistinct bright patch or as a dark silhouette against other luminous matter.
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Red giant
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A very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion
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Supergiant
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A very large star that is even brighter than a giant often despite being relatively cool
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Planetary Nebula
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A ring shaped nebula formed by an expanding shell of gas around an aging star
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White Dwarf
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A small very dense star that is typically the size of a planet, a white dwarf is formed when a low mass star has exhausted all it's central nuclear fuel and lost its outer layer as a planetary nebula.
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Supernova
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A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of it's mass.
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Neutron Star
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A celestial object of very small radius and a very high density.
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