Across
- 5. system The sun, planets, moons, asteroids and comets for instance
- 6. A cloud in outer space, mostly made of hydrogen and helium
- 8. Ours is made mostly of nitrogen and oxygen gas
- 9. Largest moon in the solar system
- 11. Earth's sister planet, too hot to live on
- 15. A belt of constellations starting with Aries and ending with Pisces
- 16. The seventh planet, it's tipped on its side
- 17. Dipper Seven stars that form the outline of a saucepan
- 19. The largest planet in our solar system
- 20. A large collection of billions of stars bound by gravity
- 21. Large and small rocks mainly found between Mars and Jupiter
- 22. A mix of ice and rock, it forms a long tail when it gets near the sun
- 23. Our nearest neighbor in space
- 26. hole A collapsed star with so much gravity its light can't get out
- 27. This spacecraft landed people on the moon
- 28. A rock from outer space that hits a planet like Earth
- 29. A space object that makes its own light by nuclear fusion
- 31. Innermost planet of our solar system
Down
- 1. Sixth planet from the sun, has beautiful rings
- 2. The "red planet"
- 3. An old red giant star in the constellation Orion
- 4. Third planet from the sun, it's filled with life
- 7. He figured out that planet orbits are elliptical not round
- 10. Far-out world discovered in 1930 by Clyde Tombaugh
- 12. This force keeps us from floating out into space
- 13. The eighth planet, 3 billion miles out
- 14. A room where the stars appear on a domed ceiling
- 18. He discovered moons orbiting Jupiter
- 22. An imaginary picture made out of connecting stars together
- 24. These are launched from Florida's Space Coast
- 25. A place from which to observe the sky and the universe
- 30. Someone who travels beyond the Earth's atmosphere