Space

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Across
  1. 1. is a spot or patch that appears from time to time on the sun's surface, appearing dark by contrast with its surroundings.
  2. 3. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
  3. 6. an artificial body placed in orbit round the earth or moon or another planet in order to collect information or for communication.
Down
  1. 2. is a celestial body moving in an elliptical orbit around a star.
  2. 4. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  3. 5. a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
  4. 7. is a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million miles).