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Across
  1. 3. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  2. 5. the star round which the earth orbits.
  3. 6. a small rocky body orbiting the sun.
  4. 7. a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 million million miles).
  5. 9. 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.
Down
  1. 1. a celestial body moving in an elliptical orbit around a star.
  2. 2. a celestial body orbiting the earth or another planet.
  3. 4. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun.
  4. 5. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
  5. 8. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.