Asteroid

A small rocky body orbiting the sun

Asteroid Belt

The region of the solar system between the orbits of Mars and Jupiter

Atmosphere

A mixture of glasses that surrounds a planet or moon

Comet

A ball of frozen dust and rock that orbits the sun and has a tail

Crater

A large round pit caused by the impact of a meteroid

Galaxy

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

Gas giant

The outer planet

Gravity

A force that pulls objects towards each other

Planets

A celestial body moving in an elliptical

Moon

A natural object that orbits a planet

Milky Way

The galaxy containing the solar system

Orbit

The path an object follows as it moves around another object

Revolution

The movement of an object around another object

Rotation

The spinning motion of a planet on its axis

Solar System

The collection of eight planets and their moons in orbit around the sun

Star

A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion

Terrestrial

The name of the inner planets

Dwarf Planet

a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classified as such.

Light year

The distance light travels in one year

Kuiper Belt

A region of the solar system that is just beyond the orbit of Neptune

Meteor

A small body of matter from outer space that enters the Earth's atmosphere appearing as a streak of light

Universe