Apollo 11 Spaceflight, First Manned Moon Landing

Luna 15 was a Soviet probe designed to collect lunar soil and return it to Earth and study circumlunar space and the lunar gravitational field, which could have given the Soviets more Moon glory. The mission along with Apollo 11 played a important role in the culmination of the Space Race. Luna 15 was launched 3 days before Apollo 11 and reached lunar orbit before Apollo 11. During descent, a malfunction caused Luna 15 to crash on the Mare Crisium of the Moon, just after Armstrong and Aldrin completed their moon walk.
The parallel missions of Luna 15 and Apollo 11 were the climax of the Space Race that underlay the space programs of both the United States and the Soviet Union in the 1960s. The simultaneous missions became one of the first instances of Soviet/American space cooperation as the USSR released Luna 15's flight plan to ensure it would not collide with Apollo 11, though its exact mission was unknown. The Jodrell Bank radio telescope was later discovered to have recorded transmissions from Luna 15 during its descent and this was published in July 2009 as to celebrate the 40th anniversary of Apollo 11.