Across
- 1. large and small rocks or metallic masses orbiting the sun
- 6. remains of a meteoroid that strike the surfac of a planet or moon
- 8. a celestial body consisting of a mass of gas held together by its own gravity where energy comes from internal nuclear reactions
- 10. planets the rocky, terrestrial planets Mercury, Venus, Earth and Mars, whose orbits are inside the asteroid belt
- 13. a natural or artificial body in orbit around a planet
- 14. a large celestial body that revolves around a star
- 15. a natural chunk of rock or dust existing outside Earth's atmosphere
- 17. the glowing, heated dust which covers the nucleus of the comet
- 18. the force that causes objects with mass to attract one another
Down
- 2. a group of interrelated, interdependent elements forming a complex whole
- 3. the star made of helium and hydrogen which Earth and other planets revolve
- 4. a celestial body of ice, dust and rock with an elongated and elliptical orbit
- 5. a curved path followed by a satellite as it revolves around an object
- 7. on or of Earth
- 9. objects objects such as planets, moons and stars that are located in space
- 11. system a star and group of planets and other celestial bodies that are held together by gravitational attraction and revolve around it
- 12. a small object that enters Earth's atmosphere from space and burns due to friction, and light
- 15. a celestial body that revolves around the planet
- 16. planets the planets Jupiter, Saturn, Uranus and Neptune whose orbits lie beyond the asteroid belt
- 19. belt the region between inner and outer planets where most asteroids orbit the Sun.