Across
- 4. the size of the sun
- 6. a huge ball of glowing gas
- 9. the force which keeps space objects toward one another
- 10. the name of our planet
Down
- 1. a celestrial body that is in orbit around the sun
- 2. chemical elements which has formula H2
- 3. a period of 365 days
- 5. a system of planets, icluding our earth and sun
- 7. our star
- 8. a large system of stars, one of which is our star