Made up of gas, dust, and billions of stars and has different shapes

spherical or flattened disks

A nucleus of bright stars and two or more spiral arms

no definite shape

The distance light travels in on year

(Gas and dust) exist in space and are remnants from the formation of the universe when it formed

May have rings or other unique surface characteristics

Most are rocky bodies covered with craters, but some have unique characteristics

Some _____ outside the belt have orbits that cross Earth's orbit, which require scientists to monitor their position

Have long, narrow, elliptical orbits that cause them to cross paths with other objects in the solar system

Chunks or rock that burn up upon entering a planet's atmosphere

Prior to entering the atmosphere the chunks of rock move about within the solar system and are known as _____

When the chunk of rock strikes the surface of a planet or moon it is known as a _____

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