| A | B |
|---|
| orbit | the path of an object moves around another body |
| atmosphere | the air that surrounds the Earth and other planets |
| rotate | to spin on an axis |
| axis | an imaginary line that runs through the North Pole to the South Pole |
| eclipse | the temporary blotting out of the light of a heavenly body |
| Astronomy | the scientific study of stars, planets, or objects in space |
| asteroid | small rocky objects that orbit around the sun |
| gravity | the pull of objects toward Earth |
| meteorite | a hunk of rock or metal from space that falls to Earth, another planet, or moon |
| meteor | a streak of light caused by a hunk of rock entering the earth’s atmosphere |
| galaxy | a large system of stars |
| constellation | a group of fixed stars |
| satellite | a small body that revolves around a larger body such as a planet |
| revolve | to move around a central point |
| rotate | to spin on an axis |
| revolution | the movement an object makes one time around another object |
| Solar System | the sun and the planets, moons, asteroids, comets, and dust particles that are in orbit around the sun |
| comet | a small object in orbit around the sun |
| telescope | an instrument to see distant objects |
| astronaut | a person trained to pilot a spacecraft |
| crater | a bowl shaped pit where meteorites have hit the Earth |
| meteoroid | a hunk of rock or metal in space |
