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Across 1. All matter that exists 3. Is the dominant member at the center of the Solar system we live in 4. A new category of celestial body created by the International Astronomers Union in 2006 5. A reusable vehicle that takes off like a rocket and lands like an airplane 6. The four largest moons of Jupiter; Io, Europa, Ganymede, and Callisto, discovered by Galileo in 1610 10. Are Jupiter, Saturn, Uranus, and Neptune 11. The second largest planet in the Solar System 12. Large planets made mosttly of gasses, Jupiter, Saturn, Uranus, and Neptune 17. a mass of gas in space that generates energy by the sun 18. Is the closest planet to the Sun 19. The only planet we know of that supports life 20. Is a meteoroid that has hit the ground

Down 2. Dense, small, and rocky like Earth, Mercury, Venus, and Mars 7. A star and all objects caught in its gravity, that together form a system 8. This planet rotates in the opposite direction than Earth 9. A natural satellite of a planet 13. A small rocky, body that revolves around the Sun 14. Called giant of giants; made mostly of hydrogen and helium 15. Dwarf planet covered by frozen nitrogen 16. An object that revolves around a star and has enough mass that gravity forces it to assume a spherical shape; not a satellite or another planet