When Is a Planet Not a Planet?
Across
- 3. Not on the plane, not flat
- 5. Elon Musk wants us to go there
- 7. Shape of most planets' orbits
- 8. The telescope that took pictures on p411
- 9. Pluto's moon
- 11. The only planet with known biology
- 15. The disc around our sun before planets were formed
- 17. Hottest planet in our solar system
- 19. Discovered Pluto's moon
- 20. The coldest planet
- 21. Nebula 1500 ly away
- 22. Jupiter, Saturn, Uranus* & Neptune*
- 25. First planet from the Sun
- 26. Scientists studying the stars & planets
- 29. Was once considered a planet
- 30. The solid outer layer of a rocky planet
Down
- 1. Imaginary flat disc that shows where the planets and other objects travel around the sun
- 2. Space cloud of dust, ice, gas and rocks
- 4. The line from one side to the other through the center of a circle
- 6. Nebula pictured on title page
- 10. The 8th planet
- 12. The "A" in IAU
- 13. The center or middle of an object or planet
- 14. Has the widest rings in our solar system
- 16. Made of rocks and dirt
- 18. Energy visible from our star
- 22. Force that keeps objects orbiting
- 23. An important star
- 24. What Pluto's core is probably made of
- 27. Shape of Pluto's orbit
- 28. The largest planet in our solar system