asteroid

a small rocky body orbiting the sun

asteroid belt

the region of the solar system between the orbit of mars and jupiter

atmosphere

the mixture of gases that surrounds a planet or moon

comet

a small body of matter from outer space .

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 giant

the outer planets

gravity

a force that pulls objects toward each other

planets

a celestial body moving in a elliptical orbit around a star

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 .

revoulution

the movement of an object around another object .

rotation

the spinning motion of a planet on its axis .

solar system

the collection of eight plants and their moons in orbit around the sun

star

a ball of hot gas , primarily hydrogen and helium , that undergoes nuclear .

terristial

the name of the inner planets .

dwarf planets

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

all of space and everything in it .