Space Vocabulary #2

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Across
  1. 2. the lightest chemical element, often a gas
  2. 4. a space object made of ice and dust that orbits a star and develops a long, bright tail as it nears its star
  3. 9. like Earth; describes planets that are rocky and Earthlike in size
  4. 15. a small planet that is second from the Sun, a terrestrial planet
  5. 17. the largest planet in our solar system and the fifth from the Sun, a gas giant
  6. 19. a gas that has no color, taste or smell, and which people need to live
  7. 21. a single turn of something around an axis or a fixed point, spinning
  8. 22. a body in outer space, made of hot gases, that shines in the night sky
  9. 23. a planet with large rings around it that is sixth from the Sun, a gas giant
  10. 24. a large blue planet that is eighth from the Sun, a gas giant
  11. 26. the third planet from the Sun
  12. 27. the measure of the amount of matter in an object
  13. 31. a layer of gases surrounding a planet, star or moon
  14. 32. the bright, vaporized part of a comet that points away from the Sun
  15. 33. the center of an object
Down
  1. 1. to revolve around another object
  2. 3. the center of a comet, made of small particles of ice and frozen gas that can turn a tail as the comet nears a star
  3. 5. a colorless, odorless, flammable gas commonly called "natural gas"
  4. 6. a single journey along an orbital path
  5. 7. a substance with no foxed volume or shape that can expand freely
  6. 8. the smallest planet in our solar system and the closest to the Sun, a terrestrial planet
  7. 10. an irregularly shaped rock that orbits a star
  8. 11. a dwarf planet that was discovered in 1930 and that was once considered a planet
  9. 12. anything that takes up space and has weight
  10. 13. Earth's only natural satellite
  11. 14. a hole in the ground caused by the impact of an object from space
  12. 16. a very large object that orbits a star
  13. 18. a large blue-green planet that is seventh from the Sun, a gas giant
  14. 20. the force that pulls all objects toward each other
  15. 25. a small reddish planet that is fourth from the Sun, a terrestrial planet
  16. 28. a natural or human-made object that orbits Earth or another object in space
  17. 29. a solid object that travels around a planet, a natural satellite
  18. 30. the second lightest chemical element, often a gas