Astronomy

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Across
  1. 2. the moon, sun, and the known planets—Mercury, Venus, Mars, and Jupiter—orbit Earth
  2. 3. The center of the Milky Way galaxy is a ___________ ___________.
  3. 9. large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions
  4. 15. The slow movement of the axis of a spinning body around another axis due to a torque acting to change the direction of the first axis
  5. 16. the duration of a complete rotation of the Milky Way, approximately 200 million years
  6. 17. the point at which the moon is farthest from Earth
  7. 18. the moon moves in a line directly between Earth and the sun, casting a shadow on Earth
  8. 19. Most of the lunar surface is made up of densely pitted, light-colored areas
  9. 24. an imaginary plane that connects Earth’s orbit with the celestial sphere
  10. 25. The very darkest part of the moon's shadow is cone-shaped
  11. 26. the shadow cast by the earth or moon over an area experiencing a partial eclipse
  12. 29. the time in January when Earth is closest to the sun
  13. 30. _________ are caused mainly by differences in how much the moon's gravity pulls on different parts of Earth.
  14. 31. When the moon is at a right angle to the sun
  15. 36. Earth and the other planets orbit the sun
Down
  1. 1. the motion of a body, such as a planet or moon, along a path around some point in space
  2. 4. – a thin, gray layer on the surface of the moon, consisting of loosely compacted, fragmented material believed to have been formed by repeated impacts of meteorites
  3. 5. the depression at the summit of a volcano or a depression produced by a meteorite impact
  4. 6. the time it takes for Earth to make one complete rotation (360º) with respect to a star other than the sun
  5. 7. designed and built instruments to measure the locations of the heavenly bodies
  6. 8. the moon passes through Earth’s shadow
  7. 10. a result of the motion of the moon and the sunlight that is reflected from its surface
  8. 11. created a model of the universe that accounted for the movement of the planets
  9. 12. the average distance between Earth and the sun
  10. 13. a long channel associated with lunar maria
  11. 14. He proposed a model of the solar system with the sun at the center
  12. 20. the point at which the moon is closest to Earth
  13. 21. an oval-shaped path
  14. 22. any of a system of bright, elongated streaks, sometimes associated with a crater on the moon
  15. 23. discovered three laws of planetary motion
  16. 27. the apparent westward motion of the planets with respect to the stars
  17. 28. a tide just after a new or full moon, when there is the greatest difference between high and low water
  18. 32. the time in July when Earth is farthest from the sun
  19. 33. the science that studies the universe
  20. 34. relation to stars or constellations
  21. 35. the turning, or spinning, of a body on its axis