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Across 3. Types of planets that are small, dense, and rocky 7. Spectacular light shows caused by streams of particles that interact with Earth's upper atmosphere 9. The month that the Earth is actually closest to the sun 10. A natural or artificial body that revolves around larger bodies like planets 12. The amount of matter in an object, and its value does not change 14. Planet with 63 total moons and a Great Red Spot that is a storm more than 400 years old 17. The Earth is tilted on its _________ at 23.5 degrees 20. Smallest planet in the solar system 22. "Sun ______" are cooler, dark spots on the sun 24. Bright streak of light when a meteoroid enters Earth's atmosphere 26. A measure of gravitational force exerted on an object 28. Type of immense spherical cloud containing comets that surrounds our Solar System 29. Giant storms on the surface of the sun are called "Solar __________" 30. A celestial body that is in orbit around the sun

Down 1. Pertaining to the sky or visible heavens 2. The force of attraction between objects that is due to their masses 4. The study of all physical objects beyond Earth 5. A system for organizing time 6. The first person to use a telescope to observe celestial bodies 8. The time require for Earth to rotate once on its axis 11. Occurs when the shadow of one celestial body falls on another 13. The closest star to Earth 15. Called the "Red Planet" 16. Daily movements of ocean water that change the level of the ocean's surface 18. "Asteroid ______" - located between Mars and Jupiter 19. Solid center of a comet 21. The time required for the Earth to orbit the sun once 23. Planet that is famous for its spectacular rings 25. Only known location in the solar system that supports life 27. Roughly the amount of time required for the moon to orbit the Earth once