A body that orbits another body.

All bodies that have mass exert a force that pulls other objects with mass toward themselves.

As the moon revolves around Earth, the portion of the moon that reflects sunlight back to Earth changes, causing the moon's appearance to change.

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Lesson 2 Unit 3

Moon Phases and Eclipses

Term	Definition
Satellite	A body that orbits another body.
Eclipse
Gravity	All bodies that have mass exert a force that pulls other objects with mass toward themselves.
Umbra
Lunar Phases	As the moon revolves around Earth, the portion of the moon that reflects sunlight back to Earth changes, causing the moon's appearance to change.
Penumbra