Across
- 5. Fusion The combining of two atomic nuclei onto a single larger nucleus, as when two holver atoms join together to form gas realeasing energy
- 7. A meteoroid that hit Earth's surface
- 9. A description of the solar system in which all of the planets revolve around earth
- 11. belt The region of the solar system between the orbits of mars and jupitar where many asteroids are found
- 12. The attractive force between two objects its magnitude depends on their masses and the distance between them
- 13. A system of millions or billions or stars held together by gravitional attraction
- 15. A chunk of rock or dust in space
- 16. Rotation The spinning motion of a planet from east to west opposite to the direction of rotation of most planets and moons
Down
- 1. A description of the solar system in which all of the planets revolve around the sun
- 2. Any object that revolves around another object in space
- 3. Planets The name given to the four inner planets mercury venus earth and mars
- 4. A streak of meteor in the sky produced by the burning of a meteoroid in Earth's atmosphere
- 6. A ball of ice and dust whose orbit is usually a long, narrow
- 8. The path of an object as it revolves around another object in space
- 9. Giants The name given to the first four outer planets Jupitar, Saturn, Uranus, Neptune
- 10. The study of the moon, stars, and other objects in space
- 14. A scientist who studies the universe beyond earth