| A | B |
|---|
| satellite | natural or artificial object orbiting another in space |
| planet | large body in space that orbits the Sun |
| orbit | curved path of one object around another |
| ellipse | flattened circle or oval |
| asteriods | large chunk of rock or metal that orbits the sun |
| comets | lump of ice, frozen gas, and dust that orbits the sun |
| astronomy | study of stars, planets, and other objects in space |
| solar system | sun and all th ebodies that orbit it |
| meteoroid | small piece of rock or metal that travels through space |
| meteor | rock or metal that enters Earth's atmosphere |
| meteorite | rock or metal that hits the surface of a planet or moon |
| galaxy | huge group of stars, gas, and dust that travel through space |
| nebula | could of gas or dust in space |
| perihelion | point in a planet's orbit when it is closest to the sun |
| aphelion | point in a planet's orbit when it is farthest from the sun |
| mare | broad, flat plains on the Moon's surface |
| crater | round hole on the Moon's surface |
| nucleus of a comet | head or solid part of a comet |
| coma | gas cloud that surrounds the nucleus of a comet |
| tail | long, ribbonlike trail of comet dust and gas |
