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Across 3. The sun is actually not gas, but "a miasma of incandescent _________," which is like a gas with an electrical charge. 5. __________ means equal night, and happens in the spring and fall. 6. ___________ is an attractive force that depends on the masses of objects and their distance apart. 7. The ________ is defined as all of space and everything in it. 11. A moon that is less than half full is a _________ moon. 13. The true shape of orbits is an ____________, which is an elongated cirle or oval shape. 14. The longest and shortest days of the year are called ___________. 17. The _______, (meaning crown), is the outer layer of the sun's atmosphere 21. An object will look different when viewed from different angles, due to ________. 23. A German scientist named ____________ described the true shape of orbits and came up with three laws of planetary motion. 24. Roy G. Biv is a colorful man, whose name spells out the whole color spectrum (which is also known as __________ light.) 25. The correct model of our solar system is the _________ model, with the sun in the center. 27. The motion of one object around another, as in orbiting is called _____________. 29. Earth's ______ is tilted at 23.5 degrees from vertical. 31. An ______ occurs when one object blocks light and casts a shadow on another object. 32. The Milky Way is a ________ galaxy. Others are elliptical or irregular shaped. 33. Dark spots on the moon, called ________, were formed from cooling lava after meteor impacts broke open the surface of the moon.

Down 1. When _______ announced he had evidence to support the theory of a sun-centered universe, he was put on house arrest! 2. The sun is a mass of incandescent gas, a gigantic nuclear furnace. Where hydrogen turns into ________ at a temperature of millions of degrees! 4. These waves have the longest wavelength on the electromagnetic spectrum. 6. A moon that is over half full, but not totally full, is called a ________ moon. 8. Moving objects want to stay in motion. Stopped objects want to stay in place. All of these objects have _______. 9. A __________ happens when a very large star explodes near the end of its life. 10. __________ stars burn longer than large ones, because they use their fuel more slowly. 12. The idea that the Earth is in the center of the universe is the ____________ model. 15. ____________ is the motion of an object spinning on its axis. 16. A star or a planet can form from a cloud of gas and dust called a _________. 18. ____________ is the study of the moon, stars, and other objects in space. 19. The crucial requirements for life -- liquid water, a suitable temperature, and an atmosphere -- are called the "___________ Conditions." 20. A star's brightness is called its _____________. 22. Magnetic storms on Earth are caused by the ________, which is a stream of charged particles moving through space away from the sun. (2 words) 26. Since Earth is tilted on its axis and revolves around the sun, we have __________. 28. A ________ is a cluster made up of hundreds of billions of stars. 30. These types of rays have the shortest wavelength on the electromagnetic spectrum.