Across
- 3. Round pits caused by meteoroids. 681
- 5. Only planet tilted on its side.
- 7. A model of the universe with the Sun at the center. 702
- 10. Force of gravity on an object. 667
- 12. A spacecraft that carries scientific instruments, not humans. 691
- 13. Areas of gas on the Sun's surface that are cooler. 708
- 15. A dirty snowball in space. 731
- 17. The highest tide. 677
- 18. You can see the entire side of the moon. 673
- 23. Sixth planet in the Solar system.
- 24. The spinning of Earth on its axis. 661
- 27. Last planet in the Solar system.
- 28. Most important tool for the growth of astronomy. 680
- 29. Any object that revolves around another object. 688
- 31. The outer planets are made mostly of this. 721
- 33. The inner layer of the Sun's atmosphere. 708
- 35. When the moon appears to be growing. 672
- 36. Hottest planet in the Solar system.
- 39. the study of the moon, stars, and other objects in space. 660
- 41. Group of missions that landed humans on the Moon. 689
- 42. Fourth planet from the Sun.
- 43. The Earth has seasons because its axis is __ 662
- 44. Closest planet to the Sun.
Down
- 1. A device that expels gas to move in the opposite direction. 684
- 2. Attractive force between objects. 666
- 4. Largest planet in the Solar system.
- 6. Rocky objects in space. 732
- 8. The oval shape of orbits discovered by Kepler. 703
- 9. The lowest tide. 677
- 11. The longest or shortest day of the year. 663
- 14. Tendency of an object to resist a change in motion. 668
- 16. The day that the Sun is directly over head at the equator. 665
- 17. Eruptions from the Sun's surface. 710
- 19. The movement of one object around another. 661
- 20. When the moon appears to be shrinking. 673
- 21. Process in the Sun's core where hydrogen join to make helium. 707
- 22. A model of the universe with Earth at the center. 701
- 25. When the Moon or Earth cast a shadow on one another. 673
- 26. Rocky planets are called this. 712
- 28. The rise and fall of ocean water from the Moon and Sun's gravity. 676
- 30. the velocity a rocket must reach to fly beyond a planet's gravity 685
- 32. Amount of matter in an object. 667
- 34. The path of revolution. 661
- 37. Seas on the moon. 681
- 38. The outer layer of the Sun's atmosphere. 708
- 40. An asteroid in our atmosphere. 733