Across
- 2. a well-substantiated explanation of an aspect of the natural world that can incorporate laws, hypotheses and facts.
- 3. a galaxy that is circular and has old stars
- 7. group of planets and other bodies orbiting around the Sun
- 10. a big explosion of a star
- 11. a bunch of gas and dust in space
- 14. an force that attracts 2 objects together
- 15. a fundamental unit used in SI and the metric system
Down
- 1. clues or information that prove something
- 4. the average distance between the Earth and the Sun
- 5. all matter in space
- 6. the center of a galaxy
- 8. a type of galaxy that has arms
- 9. the spiral galaxy in which our Solar System is in
- 12. the distance light travels in a year
- 13. system of Solar Systems