Variable Star
Any star whose brightness or magnitude varies with time. The variations can be intrinsic because of internal processes or extrinsic, due to eclipses, dust and other phenomena. Variations can also be irregular or periodic. There are many sorts of variable stars, including Cataclysmic, Cepheid, Extrinsic, Eruptive, Intrinsic, Irregular, Long-Period, Regular, and Semi-Regular.
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Category: Astronomical
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Valhalla
In Norse mythology, Odin's hall, where he received the souls of slain warriors.
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Category: Astronomical
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Venus
Planet second in order from the sun. In Roman mythology, goddess of love (Greek name, Aphrodite).
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Category: Astronomical
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Vent
An opening or fissure in a planet's surface through which volcanic material erupts.
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Category: Astronomical
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Viscosity
A measure of resistance to flow.
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Category: Astronomical
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Volcanic rock
Rock formed by eruption onto a planet's surface.
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Category: Astronomical
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