sep 5, 1981 - The US(finally) lands on Earthernia's green moon

Description:

A group of 4 astronauts are sent to the green moon to study it. They don't spend long there, and survey results are soon [classified] by NASA. The 4 astronauts end up dead(unknown cause) and conspiracies develop about the green moon being hollow, and the moonlet orbiting the pink moon is artificially made. In reality, NASA finds the 2 moons to be artificially painted, and the pink moonlet to be a man-made object, built by an "unknown individual". This information is kept secret for years.