ASTEROID: Pieces of rock that orbit the sun between Mars and Jupiter

AXIS: An imaginary line that runs through the north and south poles of a planet

COMET: A mass of gas and dust that orbit the sun

CONSTELLATION: A group of stars that form a pattern

CRATER: Depression on the surface of a planet caused by a meteorite

DIAMETER: Distance across a round object

GALAXY: A large collection of and planets held together in a group

GRAVITY: Force that draws all objects to the center of the Earth

INNER PLANETS: The 4 closest planets to the sun

LIGHT YEAR: Distance light travels in a year/ 186,000mi per second

LUNAR: Of the moon

LUNAR ECLIPSE: When the Earth passes between the sun and the moon

METEOR: A piece of rock from outer space that enters the Earth's atmosphere

METORITE: A meteor that strikes the surface of a planet

MILKYWAY: The galaxy that Earth is in

MOONS: Satellites of a planet

NEBULA: A large cloud of dust in space

NOVA: A dim star that becomes thousands of times brighter

OUTER PLANETS: 5 planets farthest from the sun

ORBIT: The path a planet follows around the sun

PROMINICES: Large flames that jump from the surface of the sun

SOLAR: Of the sun

SOLAR ECLIPSE: When the Earth passes between the sun and moon

SOLAR SYSTEM: Group of skybodies that orbit the sun