Space people

123456
Across
  1. 3. what’s the color of Laplace’s cloak
  2. 5. who awarded a metal to Maria Mitchell
  3. 6. how many people on this list won a Nobel prize
Down
  1. 1. what was this presentation called
  2. 2. what did Johann discover
  3. 4. were was Arno Allan Penzias born