Across
- 1. The most active type of active in the universe
- 5. A star made up of degenerate matter
- 6. A rocky object in space
- 7. A particle with opposite properties to those of its matter counterpart
- 9. An icy object that exist within the Solar System
Down
- 2. The study of the universe
- 3. The distance traveled by electromagnetic radiation in one year
- 4. The outer part of the suns atmosphere
- 6. An angular measurement of height
- 8. The reflectivity of an object