... Apollo 12 Visits Surveyor 3 . ... Apollo 12 was the second mission to land humans on the Moon. ... X-Ray Moon . ... Consider the image in three parts: the bright hemisphere of the x-ray moon, the darker half of the moon, and the x-ray sky background. ... Although auroras might first appear to be moonlit clouds, they only add light to the sky and do not block background stars from view. ... The disk of our Milky Way Galaxy is home to hot nebulae, cold dust, and billions of stars. ... Surveyor Slides ...