The Earth and Sun

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Across
  1. 3. the part of an atom that contains protons and neutrons; the center of something
  2. 4. the smallest particle of a substance
  3. 5. the entire collection of planets and other bodies that orbit the sun
Down
  1. 1. a noun meaning a type of storm
  2. 2. means to turn on an axis
  3. 4. a layer of gas surrounding a planet
  4. 6. the path that planets take around the sun
  5. 7. the star at the center of the solar system.