Planets

123
Across
  1. 1. The hottest planet. This planet is so hot, most metals are liquids in its surface.
  2. 3. Someone trained to travel in a spacecraft.
Down
  1. 2. is the only planet that is not in the same position as the others, it spins on its side!
  2. 3. the third human spaceflight program carried out by NASA in the United States