Across
- 3. Earth revolves around this star
- 5. Study of stars, planets and other objects in space
- 7. A circular or elliptical path of one object around another
- 8. Closest planet to Sun
Down
- 1. Force that pulls objects towards earth
- 2. Layer of gases that surround the earth
- 4. Strange object seen in the sky
- 6. Galaxy home to Solar System