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Across 3. A loop of gas that links different parts of sunspot regions is a ________. 7. Types of planets that are small, dense, and have rocky surfaces 9. Planet that is famous for its spectacular rings 11. The study of all physical objects beyond Earth 12. Between the orbits of Mars and Jupiter is a region of rocky objects called the ______. 13. Called the "Red Planet" 15. The tendency for an object in motion to continue in a straight line is called _________. 16. The first person to use a telescope to observe celestial bodies 17. The atmospheres of the gas giants are composed mainly of the element ______. 21. The time require for Earth to rotate once on its axis is one 22. Magnetic storms are a result of an increase in solar wind caused by explosions called ______. 24. Planet with 49+ total moons and a Great Red Spot that is a storm more than 400 years old 25. The force that pulls the moon toward Earth is called _______. 26. The Earth is tilted on its _________ at 23.5 degrees 27. A celestial body that is in orbit around the sun 28. Occurs when the shadow of one celestial body falls on another 29. The only outer planet with a solid surface is ______.

Down 1. Nuclear fusion occurs in the ______, or center, of the sun. 2. "Sun ______" are cooler, dark spots on the sun 4. The middle layer of the sun's atmosphere is the ________. 5. The "Asteroid ______" is located between Mars and Jupiter 6. Most ancient astronomers thought that all celestial objects revolved around _________. 8. The closest star to Earth 10. The sun's energy comes from the process of __________, in which hydrogen atoms form helium. 14. Each planet and its moons form a small system. These systems combine to form the larger ______ system. 18. The time required for the Earth to orbit the sun is one 19. The planets that are closer to the sun than Earth are Venus and _____. 20. A natural or artificial body that revolves around larger bodies like planets 23. The sun's ______, which looks like a halo, can usually be seen only during an eclipse.