Million Little Stars

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Across
  1. 4. Among other meanings, inconceivably vast.
  2. 5. One of Saturn's moons – and also an Eras Tour opening act.
  3. 6. The expanse that exists beyond Earth's atmosphere and between celestial bodies.
  4. 7. From the Ancient Greek word πλανήται, meaning "wanderers."
  5. 10. Vallis Alpes, Vallis Inghirami, and Vallis Planck are all examples of this.
  6. 12. 5SOS's first North American tour.
Down
  1. 1. Groups of stars historically used for navigation.
  2. 2. The curved trajectory of a planet around its star – or a chewing gum brand.
  3. 3. Cousin of aurora borealis.
  4. 4. An icy celestial body.
  5. 8. Pioneer 11 performed the first fly-by of this planet.
  6. 9. "_ _ _, Scotty!"
  7. 11. Extraterrestrial illumination that is billions of years old.