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Across 1. second planet from the sun; similar to Earth in mass and size; has a thick atmosphere and a surface with craters, faultlike cracks, and volcanoes. 6. system of nine planets, including Earth, and other objects that revolve around the sun. 8. a meteoroid that strikes the the surface of a moon or planet. 9. second-largest and sixth planet from the sun; has a complex ring system, at least 31 moons, and a thick atmosphere made mostly of hydrogen and helium. 10. largest fifth planet from the sun; contains more mass than all the other planets comined, has continuous storms of high-pressure gas, and an atmosphere mostly of hydrogen and helium. 11. seventh planet from the sun; is large and gaseous, has a distinct bluish-green color, and rotates on an axis nearly parallel to the plane of its orbit. 14. large facility with living quarters, work and exercise areas, and equiptment and support systems fro humans to live and work in space and conduct research 15. considered to be the ninth planet from the sun; has a solid icy-rock surface and a single moon, Charon.

Down 2. reusable spacecraft that can carry cargo, astronauts, and satellites to and from and from space. 3. giant high-pressure storm in Jupiters atmosphere. 4. a piece of rock or metal made up of material similar to that which formed the planets; mostky found in the asteroid belt between the orbits of Mars and Jupiter. 5. space object made of dust and rock particles mixed with frozen water, methane, and ammonia that forms a bright coma as it approaches the sun. 7. forth planet from the sun; has polar ice caps, a thin atmosphere, and a reddish appearance caused by iron oxide in weathered rocks and soil. 8. smallest planet, closest to the Sun; does not have a true atmosphere; has a surface with many craters and high cliffs. 12. usually the eighth planet from the sun; is large and gaseous, has rings that vary in thickness, and is bluish-green in the color. 13. third planet from the sun; has an atmosphere that protects life and surface temepratures that allow water to exist as a solid, liquid, and gas.