Across
- 3. Unit seven international units
- 4. light travels in a year
- 6. Contains everything in existence and is expanding as you learn
- 8. an explosion from a dying star
- 9. an explanation of an aspect of the natural world and universe that can be repeatedly tested
- 10. An giant cloud of dust or gas
- 13. collection of gas, dust, and stars
- 14. the galaxy we live in
Down
- 1. made from a nebula
- 2. A hole that sucks in planets and stars
- 5. shapes that range from completely round to oval
- 7. proof or facts
- 9. rotating disc galaxy
- 11. primarily for measuring distances within the Solar System or around other stars
- 12. measured by the acceleration that it gives to freely falling objects