Across
- 5. particles of matter
- 7. the central point of a rotation
- 9. a cloud of gas and dust
- 10. energy emission
- 11. 9656064000000 km distance
- 13. boundary
- 16. a small body of matter
- 17. program
- 19. rock
- 21. revolution
- 22. a transmitter spacecraft
- 24. rough drawing
- 25. natural gas
- 26. a collection of stars
- 28. a body of rock or gas
Down
- 1. collection of stars
- 2. big bang
- 3. element number 1
- 4. the force pulling an object down
- 6. size
- 8. a luminous particle
- 12. ovallish
- 14. an artificial object in orbit
- 15. the study of stars
- 18. a combination of ice and dust
- 20. repetition
- 23. obscured light
- 27. a mode of transportation