Across
- 3. force that keeps planets in orbit
- 4. huge family of stars
- 7. largest planet in the solar system
- 8. third planet from the sun
- 10. Instrument used to see stars and planets
- 13. found at the centre of the solar system
- 14. rock fragments found in orbit between mars and Jupiter
- 16. known as the red planet
- 17. study of the heavenly bodies
- 18. it orbits the earth
Down
- 1. object that orbits a planet
- 2. planets rotate on their __________
- 5. the shape of the earth
- 6. closest planet to the sun
- 9. : a famous comet
- 11. planet with rings
- 12. : the planets __________ around the sun
- 15. : a mass of frozen gas and particles that travels the solar system