Unit 7: Astronomy

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Across
  1. 4. a unit used to measure very large distances in space
  2. 6. the galaxy that Earth is part of
  3. 9. a space rock that reaches Earth’s surface
  4. 10. a region between Mars and Jupiter where many asteroids are found
  5. 13. the act of watching and studying objects carefully
  6. 15. Earth’s natural satellite
  7. 16. the central part of a planet
  8. 19. a system made up of a star and all the objects that orbit it
  9. 21. a real or imaginary line that a planet rotates around
  10. 22. a small rocky body that orbits the sun, mostly between Mars and Jupiter
  11. 25. the force that pulls objects toward one another
  12. 26. an object that travels around a planet
  13. 27. the four rocky planets closest to the sun
  14. 28. one full revolution of Earth around the sun
  15. 30. the size relationship shown in a diagram
  16. 31. an object in space that produces its own light and heat
  17. 33. a frozen ball of ice and dust that orbits far from the sun
  18. 34. the planets farthest from the sun that are mostly gas
  19. 36. the spinning movement of a planet on its axis
Down
  1. 1. the movement of a planet traveling around the sun
  2. 2. a huge group of stars, gas, and dust held together by gravity
  3. 3. a large planet made mostly of gases
  4. 5. the layer of gases that surrounds a planet
  5. 7. a small piece of rock or metal moving through space
  6. 8. a large object that orbits a star and does not make its own light
  7. 11. a tool scientists use to observe faraway objects in space
  8. 12. a person who studies or travels to learn more about space
  9. 13. the curved path an object follows as it moves around another object
  10. 14. a streak of light seen when a space rock burns in Earth’s atmosphere
  11. 17. an organization in the United States that studies space and space travel
  12. 18. a word that means extremely cold
  13. 20. the star at the center of our solar system
  14. 23. the slant of Earth’s axis that causes seasons
  15. 24. the third planet from the sun and the only known planet with life
  16. 25. the process by which gases trap heat and warm a planet
  17. 29. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune *Remember the mnemonic device!
  18. 32. a planet with a solid surface
  19. 35. one full rotation of Earth on its axis