Across
- 4. A cloud of gas and dust
- 5. An optical instrument designed to make distant objects appear nearer
- 8. Earth's only natural satellite
- 9. What Jupiter, Saturn, Neptune and Uranus are made of
- 10. A person who goes into space
- 13. The only known planet to have life
- 15. The gaseous area surrounding a planet or other body
- 18. The curved path of a celestial object or spacecraft around a star, planet or moon
- 19. Large rocks in outer space
- 20. The tilt the Earth has that created the seasons
- 21. The brightest star in our Solar system
Down
- 1. A group of stars, gas and dust held together by gravity
- 2. An exploding star
- 3. The most famous dwarf planet
- 4. The main gas in our solar system
- 6. A large, bowl-shaped cavity in the ground or on the surface of a planet
- 7. An object consisting of a nucleus of ice and dust with a tail
- 9. The force that pulls all bodies of matter together
- 11. The collection of eight planets and their moons in orbit around the sun
- 12. Smaller rocks in space
- 14. A scientist who specialises in the universe
- 16. The galaxy our solar system is in
- 17. The event in which Earth or the moon passes through a shadow of another body