Across
- 3. A bright streak of light that results when a meteoroid burns up in Earth's atmosphere.
- 7. A large body in space that orbits a star and does not produce light of its own.
- 9. A model of the solar system in which Earth and the other planets revolve around the sun.
- 11. The tendency of an object to resist a change in motion.
- 13. a theory which states that there was no beginning to the universe and that the universe does not change in appearance.
- 14. The theory that the universe originated in a huge explosion that released all matter and energy.
- 17. A hypothesis that has been tested with a significant amount of data.
- 18. All of space and everything in it.
- 19. rocky metallic objects that orbit the sun but are too small to be considered planets.
Down
- 1. Chunks of rock or dust from space.
- 2. large clumps of ice, dust and frozen gases that travel around the Sun in long elliptical orbits with "tails".
- 4. relating to the moon.
- 5. A force that pulls objects toward each other.
- 6. A meteoroid that passes through the atmosphere and hits Earth's surface.
- 8. sun, planets, and all the other objects that revolve around the sun.
- 10. A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
- 12. A representation of the universe in which starts and planets revolve around Earth. Ptolemy proposed the model.
- 15. Belt the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found.
- 16. the path that a body follows as it travels around another body in space.
- 20. relating to the sun.