Across
- 6. a star that group of planets and other celestial bodies that are held by its gravitational attraction and revolve around
- 7. four largest and brightest moons of jupiter
- 9. remains of a meteoroids that strike the surface of a planet or moon
- 10. group of interacting interrelated interdependent elements forming a complex whole
- 13. a regular, repeating path that one object takes around another object or center of gravity
- 16. a large celestial body that revolves around a star in a solar system
- 17. Objects, such as planets, moons, and stars, that are located in space
- 18. a celestial body that revolves around a planet
- 20. luminous star around which earth and other planets revolve
- 21. on or of earth
Down
- 1. a small object that enters earth's atmosphere from space and burns due to friction
- 2. the planets jupiter saturn uranus and neptune whose orbits lie beyond the asteroid belt
- 3. a celestial body consisting of mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior
- 4. the force that causes objects with mass to attract one another
- 5. The region between the inner and outer planets where most asteroids orbit the sun
- 8. a natural or artificial body in orbit around a planet
- 11. a natural chunk of rock or dust existing outside earth's atmosphere
- 12. heated dust and vaporized gas
- 14. Large and small rocks or metallic masses orbiting the Sun; made up of materials similar to those that formed the planets
- 15. celestial body of ice dust and rock
- 19. the rocky terrestrial planets mercury venus earth and mars whose orbit are inside the asteroid belt