... Some of the stars that form the constellation of Orion are part of a giant gas cloud complex that stretches over 100 light years and appears more than 50 times the diameter of the Moon. Mercury: A Cratered Inferno . ... Mercury's surface looks similar to our Moon's. Each is heavily cratered and made of rock. ... The Comet and the Galaxy . ... Surveyor 6 was not the first spacecraft to accomplish a soft landing on the Moon ... but it was the first to land and then lift off again! ...