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 gasses 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 meteoroid.
Galaxy
A collection of stars, dust, and gas bound together by gravity.
Gas giants
The outer planets.
Gravity
A force that pulls objects toward each other.
Planets
A celestial body moving in an elliptical orbit around the sun.
Moon
A natural object that orbits a planets.
Milky Way
The galaxy containing the solar system.
Orbit
The movement of an object around another object.
revolution
The path an object follows as it moves 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
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
All do space and everything in it.