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Across
  1. 6. a celestial body moving about the sun,
  2. 8. any of various groups of stars to which definite names have been given
  3. 10. an optical instrument for making distant objects appear larger and therefore nearer.
  4. 12. any of the large, self-luminous, heavenly bodies
  5. 13. the gaseous envelope surrounding a heavenly body
  6. 15. any of the small bodies, often remnants of comets, traveling through space
  7. 16. any of millions of small celestial objects revolving around the sun, often irregularly shaped and having a great range in size
  8. 17. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space.
Down
  1. 1. a spherical celestial body revolving about the sun, similar to a planet but not large enough
  2. 2. the obscuration of the light of the sun by the intervention of the moon between it and a point on the earth
  3. 3. a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid.
  4. 4. a theoretical massive object, formed at the beginning of the universe
  5. 5. the obscuration of the light of the moon by the intervention of the earth between it and the sun
  6. 7. the earth's natural satellite, orbiting the earth
  7. 9. any of the eight large heavenly bodies revolving about the sun
  8. 11. the explosion of a star,
  9. 14. a meteoroid that has entered the earth's atmosphere.