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 .