Space Station >> Space Station Glossary
Space Station Glossary L
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Light Curve:
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A plot showing how the light production of a star (or other variable astronomical object), changes with time.
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Light-Year:
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The distance that a particle of light (photon) would travel in a year — about 10 trillion kilometers (6 trillion miles). It is a useful unit for measure distances between stars.
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Lithosphere:
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The solid part of a planet’s surface, calm of the crust and upper mantle. On Earth, it includes the continent and the sea floor.
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Local Group:
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A small cluster of additional than 30 galaxies, including the Andromeda galaxy, the Magellanic Clouds, and Milky Way galaxy.
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