15s

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Across
  1. 3. "A space telescope" Six
  2. 5. "A space observatory" Six
  3. 8. "A small rocky body orbiting the sun" Eight
  4. 9. "A belt of the heavens within about 8° either side of the ecliptic, including all apparent positions of the sun, moon, and most familiar planets" Six
  5. 10. "One of Jupiter's moons" Two
  6. 12. Way "Our galaxy" Eight
  7. 13. "A spacecraft that studied Saturn" Seven
  8. 14. "A large, bowl-shaped cavity on the surface of a planet or moon, typically one caused by an explosion or the impact of a meteorite" Six
  9. 15. "A series of spacecraft designed for the Soviet space program" Five
Down
  1. 1. "The first artificial Earth satellite" Seven
  2. 2. "A NASA spaceflight program" Six
  3. 4. Hole "A region of space having a gravitational field so intense that no matter or radiation can escape" Nine
  4. 6. "A moon of Jupiter with a potentially habitable ocean" Six
  5. 7. "Plural of nebula" Seven
  6. 11. "One of Saturn's moons known for its ice geysers" Eight