Space!

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