Across
- 2. a group of a star and planets that surround it
- 4. when a galaxy is moving away
- 6. The theory matter was made by a small point
- 8. all stars and planets in a group
Down
- 1. a form of energy that propagates as both electrical and magnetic waves traveling in packets of energy called photons
- 3. the distance light makes in a year
- 5. giant cloud of dust and gas in space
- 7. the force that pulls all matter in
- 8. atoms making a substance that has no density