Across
- 4. developed rockets for space
- 6. the sun's atmosphere
- 7. the planet closest to the sun
- 9. launched the first liquid fueled rocket
- 11. the Earth's _____ determines the planets
- 12. unmanned research spacecraft sent beyond Earth's orbit
- 15. known as the "ringed" planet
- 16. the first man to walk on the moon
- 19. the planet with a great Red Spot
- 21. Earth's "twin" that is also the brightest object in the morning sun
- 22. surface of the sun
- 23. space station that orbits earth and is used by many countries
Down
- 1. any object that orbits another object in space
- 2. dark spots on the photosphere of the sun that may be related to solar storms
- 3. a reusable space _____ used to transport equipment and people into space
- 5. reflects the sun's light
- 6. outermost part of the sun
- 8. one orbit a planet makes around the sun
- 10. Mercury, Venus, Earth, and Mars are all inner _____
- 12. when different areas of the moon's surface are lit by the sun
- 13. energy emitted in the form of beautiful colors of light
- 14. Jupiter, Saturn, Uranus, and Neptune are all gas _____
- 17. earthlike planets
- 18. in order to be a planet a spherical object revolves around the _____
- 20. the belt of small icy objects that includes Pluto