Across
- 3. sixth planet from the sun
- 4. the first layer of a planet
- 6. circular path aroud a sun
- 8. first man to walk on the moon
- 9. used to be a planet but is now a dwarf planet
- 10. used to look deeper into space
Down
- 1. round object which orbits a star
- 2. rock floating in space
- 5. a group of stars named by ancient astronomers
- 7. large group of stars and planets bound together by gravity