Space

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Across
  1. 4. Dark or bright line in an otherwise uniform and continuous spectrum,
  2. 5. People who study planets, stars, and other celestial bodies.
  3. 6. Absolute measure of radiated electromagnetic energy (light) per unit time
  4. 7. Greek word- (literally, "wanderer"), which is derived from planasthai, a Greek verb which means "to wander.
  5. 8. Extremely large group of stars and planets that extends over many billions of light years.
  6. 10. Sometimes called minor planets, are rocky, airless remnants left over from the early formation of our solar system
Down
  1. 1. Light zips through interstellar space at 186,000. miles
  2. 2. In astronomy, any of certain groupings of stars that were imagined
  3. 3. A natural object which is located outside of the Earth's atmosphere
  4. 9. Often associated with mystery, intuition, and the feminine.