Across
- 3. A system of two stars orbiting their barycenter
- 4. an extremely dense cosmic object that can form after a star becomes a supernova
- 5. A cluster of stars
- 11. The distance light travels in 1 year. One ly is about equal to 9.5 trillion kilometers.
- 12. the stage of a star when it becomes very large and has a relatively cool surface
- 14. The average distance between Earth and the Sun is about 150 million kilometers
- 15. The name of our galaxy
Down
- 1. The region of the solar system beyond the orbit of Neptune; plutoids are located here
- 2. Universe
- 6. A relatively small cluster of several dozen galaxies, including the Milky Way
- 7. an object that orbits the Sun and is big enough to be round but doesn’t clear away all objects near its orbit
- 8. A system of solar systems and other objects.
- 9. A nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles or high-energy randomly moving particles created soon after the Big Bang.
- 10. An explosion of a star or the end of its life
- 13. A cloud of gas and dust in space between stars