Space!

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Across
  1. 3. Program to land a man on the moon, named after this Greek god
  2. 5. First real image of this was captured in early 2019
  3. 7. Space station’s name means “peace” or “world” in its operating country’s language
  4. 10. Massive asteroid belt on the outskirts of the Solar System
  5. 12. Accounts for 85% of the universe’s matter but has never been directly observed
  6. 13. First dog in space
Down
  1. 1. First man in space
  2. 2. Of Jupiter’s four Galilean moons, the only one with little to no water or ice
  3. 4. King of the Roman Gods
  4. 6. Largest Martian mountain
  5. 8. Massive explosion of dying star
  6. 9. First man on the moon
  7. 11. Only planet named for a Greek god