Space

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Across
  1. 3. The circle around a planet or moon that is the same distance from its north pole and its South Pole
  2. 8. The amount of matter something is made of.
  3. 9. the planet furthest from the sun
  4. 13. a person who is trained to travel in a spacecraft.
  5. 15. layer A part of Earth’s atmosphere that absorbs lots of the sun’s ultraviolet radiation
  6. 17. the most famous dwarf planet
  7. 18. a tiny piece of something
  8. 19. A cloud of dust or gas found between stars.
  9. 20. The stuff that everything is made of
Down
  1. 1. A large body in outer space that circles around the sun or another star.
  2. 2. A force that pulls matter together
  3. 4. A natural object that travels around a bigger natural object.
  4. 5. A loose collection of atoms moving around each other.
  5. 6. the star our solar system revolves around
  6. 7. the planet we live on
  7. 10. A planet that freely floats between stars or one that orbits a star outside our solar system
  8. 11. A donut-shaped ring of icy objects beyond the orbit of Neptune
  9. 12. A large, bowl-shaped dent in the ground
  10. 14. the curved path of a celestial object or spacecraft round a star, planet, or moon, especially a periodic elliptical revolution
  11. 16. a huge collection of gas, dust, and billions of stars