a natural or artificial body that revolves around a planet.

a force of attraction between two objects that is due to their mass.

the different appearances of the moon from earth throughout the month.

an event of which the shadow of one celestial body falls on another.

a shadow that blocks sunlight, such as the conical section in the shadow of the earth or moon.

the outer part of a shadow such as the shadow cast by the earth or the moon in which sunlight is only partially blocked.

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Moon Phases/Eclipses

Term	Definition
satellite	a natural or artificial body that revolves around a planet.
gravity	a force of attraction between two objects that is due to their mass.
lunar phases	the different appearances of the moon from earth throughout the month.
eclipse	an event of 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 moon.
penumbra	the outer part of a shadow such as the shadow cast by the earth or the moon in which sunlight is only partially blocked.