Space

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Across
  1. 2. small Solar System body
  2. 4. of rotation-Complete one revolution around its axis
  3. 5. small rocky body orbiting the sun
  4. 6. unit-Distance from the center of the earth to the center of the sun
Down
  1. 1. effect-The trapping of the sun's warmth in a planet's lower atmosphere
  2. 3. planet-The inner planets closest to the Sun