Across
- 1. Huge clouds of dust and gas.
- 3. These stars have depleted their hydrogen supply and are very old.
- 5. These hot, shrinking stars have depleted their nuclear fuels and will eventually become cold, dark, black dwarfs.
- 6. A collection of stars held together by the gravity.
- 8. the branch of science which deals with celestial objects, space, and the physical universe as a whole.
- 9. meteoroids that enter a planet's surface
- 10. Made of ice, dust & small rock.
Down
- 2. the distance light will travel in a year
- 4. a ball of hydrogen and helium fueled by fusion.
- 7. Large rock that orbits the sun