Science Crossword puzzle

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Across
  1. 3. one of two ice giants in the outer solar system
  2. 7. someone who travels in space
  3. 8. a white or colored circle or set of concentric circles of light seen around a luminous body, especially around the sun or moon.
  4. 9. the fourth planet from the Sun
  5. 11. The smallest part of a substance that cannot be broken down chemically
  6. 12. a scientist who studies the stars, planets, and other natural objects in space.
  7. 13. an object that orbits a planet or something else that is not a star
Down
  1. 1. a massive ball made mostly of hydrogen and helium
  2. 2. the smallest planet in our solar system
  3. 4. dwarf planet located in a distant region of our solar system beyond Neptune known as the Kuiper Belt.
  4. 5. objects made of dust and ice that orbit the Sun
  5. 6. a gas giant and so lacks an Earth-like surface
  6. 7. small, rocky objects that orbit the Sun
  7. 8. An easily recognized group of stars that appear to be located close together in the sky and that form a picture if lines connecting them are imagined
  8. 10. a bowl-shaped depression, or hollowed-out area, produced by the impact of a meteorite, volcanic activity, or an explosion