Astronomy

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Across
  1. 6. force that pulls objects toward the center of the earth or a large celestial body
  2. 7. Planets that are small, dense, rocky
  3. 9. Distance light travels in 1 year
  4. 10. First to believe in a heliocentric model
  5. 11. The shortest or longest day of the year
  6. 12. The star visible during the day, provides energy/heat
  7. 14. The spinning of Earth on its axis
  8. 15. A collection of stars, dust, and gas bound together by gravity
  9. 17. Planet known for being red, next to Earth
  10. 18. Discovered existence of other galaxies
  11. 19. Time it takes for the Earth to orbit the Sun
  12. 21. Each of the two times of the year when days and nights are of equal length
  13. 24. the path that a object/body follows as it travels around another object/body in space
  14. 26. An object resists change in motion
  15. 34. Earth's "Twin" that has a very high temperature
  16. 36. All of the frequencies or wavelengths of electromagnetic radiation
  17. 38. Credited with discovery of gravity
  18. 39. Known for very violent winds
  19. 40. A gigantic explosion in which a massive star collapses and throws its outer layers into space
Down
  1. 1. planets that have large atmospheres, made of hydrogen and helium
  2. 2. Space and all the matter
  3. 3. The theory that the universe originated in a huge explosion that released all matter and energy.
  4. 4. the average distance between the earth and the sun
  5. 5. Planet tipped on it side
  6. 8. Earth's natural satellite
  7. 12. A large, hot, bright ball of gas that is millions of kilometers from Earth
  8. 13. Time it takes for Earth to rotate once on its axis
  9. 16. The planet closest to the Sun
  10. 17. Civilization, used astronomy in everyday life
  11. 20. A large, reddish star late in its life cycle
  12. 22. Time it takes for the moon to orbit the Earth
  13. 23. The sun and its eight planets
  14. 25. the regular rise and fall of the ocean's surface influenced by the moon's gravity pulling on earth
  15. 27. The reason we can stay on Earth's surface
  16. 28. Believed Earth was the center of the universe
  17. 29. Instrument used to view objects in outer space
  18. 30. The largest planet in the solar system,many moons
  19. 31. an event in which the shadow of one celestial body falls on another
  20. 32. Known for its rings
  21. 33. The transfer of energy by electromagnetic waves
  22. 35. Believed the planets orbited the Sun in an ellipse
  23. 37. Planet covered mainly by water