the distance light trvels in a year used to measure a star's distance from earth
big bang theory
a theory that explains how the universe was made
the motion of the superclusters of galaxies away from each other
cloud containg dirty ice well beyond the orbit of the kupler blet
AN area containing rock-ice bodies beyond the orbit of Neptune
planets that ar outside the solar system
Milky Way Galaxy
the galaxy we live in
using transit to detect extrasolar planets.
How to detect plents
a form of energy that is transferred by a difference in temperature
the tendency of an object to resist any change in its motion
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