Across
- 3. Oval shaped with two points
- 4. Red planet
- 6. Elliot Scientist who studied the uranian atmosphere
- 9. Small robot used to explore the Martian landscape
- 10. Essential to living things
- 11. Mars belongs to this group
- 12. Blue planet
- 15. Largest moon
- 17. Backward rotation
- 21. Mass of swirling storm of clouds
- 22. Comes from decaying plants and animals, as well as, from volcanic eruptions
- 23. Cloudlike mass that surrounds the nucleus
- 24. Newton English mathematician and physicist
- 25. Small fragments and dust
- 27. Shooting stars
- 29. Beautiful planet with its system of rings
- 30. Evening and morning star
Down
- 1. Smaller moon
- 2. Robotic spacecraft sent by NASA to orbit the planet Mercury
- 5. Orbits the sun but too small to be considered planets
- 7. Landed on Mars on July 4, 1997
- 8. Fastest planet
- 12. Venus
- 13. Another term for the four moons
- 14. Thick clouds that surround planet Venus
- 16. Greek term for comet
- 18. Largest planet
- 19. Moves in elliptical orbit around the sun
- 20. Planets that are much bigger but less dense than the rocky planets
- 23. Formed from some materials left from the formation of the planets
- 26. Star at the center of the solar system
- 28. One possible mission to Mars