Storms & Stars

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Across
  1. 2. large lens or mirrow on a telescope
  2. 4. a space that does not contain any matter
  3. 5. first artificial object to orbit the earth.
  4. 6. group of star called the "seven sisters"
  5. 8. explosion of a star
  6. 10. forms the bright flash of lightning bolt
  7. 13. most basic unit of time
  8. 15. an abrupt discharge of electricity through the air
Down
  1. 1. faster rotation of any planet
  2. 3. measures the distance from the ground to the base of clouds
  3. 7. metallic object that is smaller than the planets
  4. 9. measure the distances to stars
  5. 11. a narrow funnel of whirling wind produced by a thunderstorm
  6. 12. heart of the comet
  7. 14. notable star of Cygnus