Across
- 2. ____________ von Braun helped develop space travel
- 8. belt that Pluto is in
- 9. planet called the ringed planet
- 11. the outermost part of the sun
- 13. planet sometimes called Earth's twin
- 14. research spacecraft sent beyond earth
- 15. planet most like Earth
- 17. the outer planets are called the gas _________.
- 18. belt in between Mars and Jupiter
- 19. the time it takes for a planet to revolve around the sun
Down
- 1. planet closest to the sun
- 3. ____________ Goddard launged the first rocket
- 4. the __________ of the moon are caused by the sun
- 5. the sun's atmosphere
- 6. the inner planets are also called this
- 7. spots, dark spots of the sun
- 10. the surface of the sun
- 12. planet with the Great Red Spot
- 16. shuttle, reusable space vehicle for equipment and people
- 20. determines the seasons on the earth