Across
- 2. The planet with a day longer than its year and the hottest surface temperature.
- 4. The “Red Planet” with dust storms and volcanoes.
- 8. An object that orbits a planet.
- 10. The planet tilted on its side.
- 12. The tendency of an object to resist a change in motion.
- 14. The cold planet with extreme winds up to 1,200 mph.
- 15. An icy body that develops a tail when near the Sun.
- 18. Small bodies that clumped together to eventually form planets.
- 20. Shift in light showing galaxies are moving away (evidence universe is expanding).
- 21. The force that keeps planets and moons in orbit.
- 22. The only planet known to support life.
Down
- 1. The speed needed to break free from gravity.
- 3. How the nebula became a rotating disk.
- 5. The process of particles sticking together to form larger bodies.
- 6. The planet with the largest ring system.
- 7. The process that powers stars, combining hydrogen into helium.
- 9. The shape of most planetary orbits.
- 11. The largest planet with the Great Red Spot.
- 13. The nebula began doing this as it contracted.
- 15. First step of solar system formation when gravity pulls matter inward.
- 16. A large collection of stars, gas, and dust held together by gravity.
- 17. A large cloud of gas and dust where stars and planets form.
- 19. The smallest and closest planet to the Sun.
- 23. A rocky object, often found between Mars and Jupiter.