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Across 2. The force of gravity on an object. 4. The amount of matter in an object. 5. 23.5 degrees. 8. Dark, flat areas on the moon's surface. 10. When a meteoroid enters Earth's atmosphere and produces a streak of light in the sky. 11. A tide with the least difference between consecutive low and high tides. 13. The trapping of heat in the atmosphere. 16. A tide with the greatest difference between consecutive low and high tides. 18. Sun centered model of the solar system developed by Copernicus. 19. Sun Moon Earth 21. Doughnut shaped region that extends from beyond Neptunes orbit. 22. a chunk of rock or dust in spaces that comes from comets or asteroids. 24. Large round pits on the moons surface. 25. The rise and fall of the oceans water 28. Meteoroid that pass through Earth's atmosphere and hit the surface. 29. shape of planetary orbits. 30. The spinning of Earth on its axis. 33. The different shapes of the moon you see from Earth. 34. The path that Earth follows. 35. The force that attracts all objects towards one another.

Down 1. The darkest part of the moon's shadow. 3. Mercury Venus Earth Mars 6. Sun Earth Moon 7. Earth centered model of the solar system developed by Ptolemy. 9. The study of moon, stars, and other objects in space. 12. Jupiter Saturn Uranus Neptune. 14. Rocky objects that are too small and too numerous to be considered full fledged planets. 15. An array of Radio telescopes located in West Virginia. 17. A spherical region of comets that surround the solar system. 19. when the sun reaches its greatest distance north or south of the equator. 20. The movement of one object around another. 23. When an object in space comes between the sun and a third object. 26. The tendency of an object to resist change in motion, 27. The larger part of the moon's shadow and is less dark. 29. means "equal night" 31. A "dirty snowball" 32. The imaginary line that passes through Earth's center and the North and South Poles.