Space Crosswords

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Across
  1. 2. United States' spaceflight program
  2. 3. Named after a roman god
  3. 4. Designed to travel in outer space
  4. 6. Stellar Explosion
  5. 7. Orbits around a body
Down
  1. 1. Several galaxies bound together
  2. 4. Most luminous stars
  3. 5. Exploration vehicle