Across
- 4. The brightest star in our galaxy
- 5. a area of space so dense nothing can escape
- 7. inner core of comet
- 8. the explosion of a dying supergiant star
- 10. planet we live on
- 12. spinning motion of a planet on its axis
- 13. a small dense star typically the size of a planet
Down
- 1. a science that studies outer space
- 2. all of space and everything in it
- 3. way the name of our galaxy
- 6. rocky objects orbiting around the sun
- 9. a small, old star
- 11. the force that pulls objects together