Luna 9: first soft landing on another world

The Soviet Union lands a palpable hit in the space race, claiming the first intact soft-landing of a man-made probe on another body in the solar system. Luna 9, a 200-pound sphere whose weighted base rolls to the correct orientation before opening petals exposing its camera and other instruments, proves that the lunar surface is dense enough to hold up heavy objects (previous scientific speculation has presented the possibility of a heavy lander sinking into a quicksand-like lunar surface).