6th grade planets pg d74-d91

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Across
  1. 3. this planet has a thin, mostly carbon atmosphere
  2. 5. is the point in which a planet is farthest from the sun
  3. 8. this is the word for when an object turns on its axis
  4. 10. this planet has the great red spot
  5. 13. daytime and nighttime are of ____ length in both hemispheres
  6. 14. this unit of measurement is the distance between earth and the sun
  7. 15. both astronomers believed the planets to be what shape?
  8. 16. a ball of ice, rock and frozen gases
  9. 19. a polish astronomer
  10. 21. Galileo studied the stars with what new invention?
  11. 24. the latin term for "earth centered"
  12. 27. this is a shape that is like a flattened circle
  13. 28. the cycles of day and night, phases of the moon, and the seasons are all determined by the motions of objects in ___
  14. 29. Copernicus placed the ___ at the center of the solar system
  15. 30. it takes a planet how many years to complete one revolution around the sun?
Down
  1. 1. this the imaginary line through the planet's center from north to south pole
  2. 2. this planet is a gaseous planet with no known solid surface, and a wide, thin systems of rings made of small pieces of ice and rock
  3. 4. one of the windiest planets
  4. 6. the point in orbit a planet is closest to the sun
  5. 7. mars has an _____ orbit
  6. 9. this planet rolls around in orbit
  7. 11. this means the greatest, and was the name of Ptolemy's books.
  8. 12. the latin term for "sun centered"
  9. 14. a chunk of rock and metal that orbits the sun
  10. 17. this is the moved of one object in an orbit around another object
  11. 18. this man discovered that planets have elliptical orbits
  12. 20. this process causes Earth's axis to point to different parts in the sky, and it makes it look like it's wobbling
  13. 22. this astronomer explained how objects move in space
  14. 23. a chunk smaller than an asteroid that orbits the sun
  15. 25. sometimes considered the ninth planet, sometimes considered the 8th
  16. 26. Ptolemy placed the ___ at the center of the universe
  17. 27. this planet is mostly water with areas of soil-covered rock
  18. 28. this planet makes up the majority of the combined mass of all the objects in the solar system