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Unit 4 Lesson 2
Term | Definition |
---|---|
Satellite | A natural or artificial body that revolves around a planet. |
Lunar Phases | The different appearances of the moon from Earth throughout the month. |
Eclipse | An event in which the shadow of one celestial body falls on another. |
Umbra | A shadow that blocks sunlight, such as the conical section in the shadow of the Earth or the moon. |
Penumbra | The outer part of a shadow such as the shadow cast by Earth or the moon in which sunlight is only partially blocked. |
Gravity | A force of attraction between objects that is due to their masses. |