Across
- 1. The red planet
- 3. Planet that has a day longer than its year
- 7. The process of particles sticking together to form larger bodies.
- 11. The explosion of a large star
- 12. The spinning of a planet on its axis.
- 13. A region between Mars and Jupiter filled with rocky bodies.
- 14. The process that powers the Sun by combining hydrogen atoms.
- 15. The coldest planet
- 19. Fastest planet around the Sun
- 20. A cloud of gas and dust in space where stars and planets can form.
Down
- 2. One complete trip around the Sun.
- 4. The star at the center of our solar system.
- 5. A large planet made mostly of gases, like Jupiter or Saturn.
- 6. The force that keeps planets in orbit and pulls objects toward each other.
- 8. The only planet known to have life
- 9. A tiny building block of planets formed from dust and rock.
- 10. Largest Planet
- 16. A large object that orbits a star and is spherical due to its own gravity.
- 17. Planet that spins on its side
- 18. A unit of distance equal to the space between Earth and the Sun.