The Universe
Across
- 2. a chunk of rock or metal that orbits the Sun
- 4. a spinning neutron star that emits radio waves at regular intervals
- 6. a space pilot
- 8. turning around an axis
- 9. an imaginary line about which a body rotates
- 10. a scientist who studies the universe
- 13. the distance between the top of one wave and the top of another
- 16. a small object made of snow, dust, and ice that orbits the Sun
- 17. a force of attraction between two objects
- 19. an imaginary line along which the Sun appears to be moving across the sky
- 20. a streak of light in the sky caused by a small meteoroid burning up
Down
- 1. a meteoroid that falls to the surface of a planet or a moon
- 3. a large collection of stars held together by gravitational forces
- 5. an explosive release of hot gases from the Sun’s surface
- 7. dark spots that appear on the surface of the sun from time to time
- 11. the explosion of an extremely large star
- 12. a star’s surface
- 14. the imaginary line that goes around the middle of Earth
- 15. an angled piece of glass that splits light into the spectrum of colors
- 18. the curved path of one object that travels around a larger, more mass object