Seven Sisters or Pleiades Intermediate Messier 45: Pleiades Intermediate Kepler's Laws of Planetary Motion Intermediate Finding habitable worlds Intermediate STS-132 Liftoff Space Shuttle Atlantis Intermediate ISS Assembly Intermediate Sarychev Peak eruption Beginner Chacing a comet - The rosetta mission Intermediate Buzz Aldrin step on Moon Beginner Apollo 15 liftoff from the Moon Intermediate