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Across 1. The movement of the earth around the sun. 6. This visible light color has the longest wavelength. 8. The remnants of a giant dead star from which even light cannot escape it's gravitational pull. 10. The theory that stated that the earth was the center of the universe. 11. This gas makes up the largest percetage in our atmosphere. 13. Air masses which are wet and form over large bodies of water. 14. H + H = He This happens in our sun. 18. The force of the air/atmosphere pushing down on the surface of the earth. 21. A low-level billowy cloud that has a top that looks like cotton balls and a flat dark bottom. 23. First astronomer to observe the moon and the Milky Way through a telescope. 26. The dense, rocky planets closest to the sun...(Mars, Mercury, Earth, Venus). 27. A low pressure center which rotates in a counter-clockwise direction. 28. A "shooting star" or meteoroid burning up in Earth's atmosphere. 29. Air masses which are dry and form over large land masses. 30. The spinning of the earth or other body on it's axis. 31. The distance light can travel in 1 year (9.46 trillion Km)

Down 2. The classification of radiant energy by wavelength. 3. One of the gases that is responsible for the "greenhouse effect". 4. The theory that stated that the sun was the center of the universe. 5. The curving of the path of a moving object from an otherwise straight path due to the Earth's rotation. 7. A large body of air with a certain temperature and moisture content. 9. These clouds form at the highest altitudes and are very thin and whispy. 12. The apparent shift in the wavelength of a star that is moving toward or away from something. 15. These clouds form low flat layers that cover most or all of the sky. 16. The layer of the atmosphere where all weather on earth occurs. 17. These stars are the hottest and brightest. 19. The phase change that occurs when water vapor becomes a liquid. 20. These planets are also known as the "gas giants" due to their gassy, dusty composition. 22. The transfer of energy from an area of higher temperature to an area of lower temperature. 24. The temperature at which a parcel of air becomes saturated. 25. Developed the 1st Law of Planetary Motion which stated that the planets move in elliptical orbits around the sun.