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