Apollo 15 15 separated from the booster, the S-IVB maneuvered away, and would impact the Moon about an hour after the crewed spacecraft entered lunar orbit, though due to an error the impact was away from the intended target. The booster's impact was detected by the seismometers left on the Moon by Apollo 12 and Apollo 14, providing useful scientific data. There was a malfunctioning light on the craft's service propulsion system (SPS); after considerable troubleshooting, the astronauts did a test burn of the system that also served as a midcourse correction. This occurred about 028:40:00 into the mission. Fearing that the
Apollo 11 even if it could not be justified on military, economic or scientific grounds. After consulting with his experts and advisors, he chose such a project. On May 25, 1961, he addressed the United States Congress on "Urgent National Needs" and declared: The effort to land a man on the Moon already had a name: Project Apollo. An early and crucial decision was the adoption of lunar orbit rendezvous, under which a specialized spacecraft would land on the lunar surface. The Apollo spacecraft therefore had three parts: a command module (CM) with a cabin for the three astronauts, and the only