Across
- 4. a key vector quantity
- 5. a good orbit for a communication satellite
- 8. an object that emits no light
- 9. the type of nuclear reaction inside stars
- 10. a good orbit for a spy satellite
Down
- 1. The fuel used by stars
- 2. everything!
- 3. this follows a main sequence star
- 6. The penultimate stage for a massive star
- 7. This causes a nebula to shrink