A _________ is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

Apogee

The point in the orbit of the Moon or other satellite where it is farthest from the Earth.

A celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighboring region of planetesimals

The spin of a body about its axis.

A phenomenon that occurs when the Earth passes into the shadow of the Moon.

A giant ball of hot gas that creates and emits its own radiation through nuclear fusion.

A very small, white star formed when an average sized star uses up its fuel supply and collapses.

A layer of gases surrounding a planet, moon, or star.

An atmospheric phenomenon that displays a diffuse glow in the sky in the northern hemisphere.