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Across
  1. 2. the planet on which we live; the world
  2. 4. the curved path of a celestial object or spacecraft around a star
  3. 5. a dark area or shape produced by a body coming between rays of light and a surface
  4. 7. the region of the atmosphere and outer space seen from the earth
  5. 8. a continuous area or expanse which is free
  6. 9. the time from sunset to sunrise.
Down
  1. 1. the natural agent that stimulates sight and makes things visible
  2. 2. an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination
  3. 3. the natural satellite of the earth
  4. 6. from one midnight to the next
  5. 7. the star around which the earth orbits
  6. 8. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun