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Across 1. Galileo overturned this theory. 8. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune 9. Effect This explains why Venus is hotter than Mercury. 11. A large cloud of gas and dust in space, spread out in an immense volume. 12. A space rock falling through the atmosphere. 14. A space rock in space. 17. How many degrees the earth is tilted. (hint: spell it out, don't use the numbers) 21. The scientist that is tied to the GEOCENTRIC theory. 22. A plate boundary where plates move away from each other. Down 2. Currents What is going on under Earth's surface causing tectonic plates to move. 3. A space rock on earth's surface. 4. A plate boundary where plates move towards each other. 5. Data that cannot be measured. 6. Data that can be measured. 7. A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity. 10. The moon phase during a lunar eclipse. 13. Galileo supported this theory. 15. A day on earth is determined by Earth's __________ 16. The moon phase during a solar eclipse. 18. A plate boundary where plates slide against each other. 19. The scientist that is tied to the HELIOCENTRIC theory. 20. A contracting cloud of gas and dust with enough mass to form a star.