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 17 19, the crew jettisoned the no-longer-needed SM, leaving only the CM for return to Earth. The Apollo 17 spacecraft reentered Earth's atmosphere and landed safely in the Pacific Ocean at 2:25 pm, from the recovery ship, . Cernan, Evans, and Schmitt were then retrieved by a recovery helicopter and were safely aboard the recovery ship 52 minutes after landing. The command module "America" is currently on display at Space Center Houston at the Lyndon B. Johnson Space Center in Houston, Texas. The ascent stage of lunar module "Challenger" impacted the Moon December 15, 1972 at 06:50:20.8 UT (1:50 am EST),