space and all matter and energy in it.

the distance that light travels in one year; about 4.46 trillion k.

A collection of stars, dust, and gas bound together by gravity.

A relatively large spherical body that orbits a star.

A large celestial body that is composed of gas and that emits light; the sun is a typical star

the average distance between earth and the sun.

the sun and all of the planets travel around it.

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The Universe

Term	Definition
Univers	space and all matter and energy in it.
light year	the distance that light travels in one year; about 4.46 trillion k.
Galaxy	A collection of stars, dust, and gas bound together by gravity.
Planet	A relatively large spherical body that orbits a star.
Star	A large celestial body that is composed of gas and that emits light; the sun is a typical star
astronomical unit	the average distance between earth and the sun.
solar system	the sun and all of the planets travel around it.