Space

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Across
  1. 2. Earths only natural satellite
  2. 5. an astronomical object comprising a luminous spheroid of plasma
  3. 6. a minor planet
Down
  1. 1. an icy, small Solar System body that warms and begins to release gases
  2. 3. Distinct luminescent part of interstellar medium
  3. 4. a fundamental interaction which causes mutual attraction between all things with mass or energy.