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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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