US and USSR Exchange Lunar Samples

NASA Photo Collection

Apollo 11 was the first spaceflight that landed humans on the Moon. Americans Neil Armstrong and Buzz Aldrin landed on July 20, 1969, at 20:18 UTC. Armstrong became the first to step onto the lunar surface six hours later on July 21 at 02:56 UTC; Aldrin joined him about 20 minutes later. They spent about two and a quarter hours together outside the spacecraft and collected 47.5 pounds (21.5 kg) of lunar material for return to Earth. The third member of the mission, Michael Collins, piloted the command spacecraft alone in lunar orbit ​until Armstrong and Aldrin returned to it just under a day later for the trip back to Earth. https://en.wikipedia.org/wiki/Apollo_11

The mission plan of Apollo 11 was to land two men on the lunar surface and return them safely to Earth. The spacecraft carried a crew of three: Mission Commander Neil Armstrong, Command Module Pilot Michael Collins, and Lunar Module Pilot Edwin E. Aldrin Jr., was launched by a Saturn V from Cape Kennedy on July 16, 1969, and after three days until they entered lunar orbit. Collins was awaiting on Lunar orbit while the Eagle Lunar Module with Armstrong and Aldrin and has landed in Moon's Mare Tranquillitatis at 3:17 p.m. EST on July 20, 1969. Immediately after landing on the Moon, Armstrong and Aldrin prepared the LM for liftoff as a contingency measure. Following the meal, the astronauts began preparations for the descent to the lunar surface. Armstrong emerged from the spacecraft first. While descending, he released the Modularized Equipment Stowage Assembly on which the surface television camera was stowed, and the camera recorded humankind's first step on the Moon. A sample of lunar surface material was collected and stowed to assure that, if a contingency required an early end to the planned surface activities, samples of lunar surface material would be returned to Earth. Astronaut Aldrin subsequently descended to the lunar surface. The astronauts collected lunar samples, deployed several experiments, and made photographs of the lunar surface. Two and a quarter hours later, the astronauts reentered the Lunar Module, after which the astronauts slept. The ascent from the lunar surface began 21 hours and 36 minutes after the lunar landing. In about four days, the Command Module entered Earth atmosphere and landed in the Pacific Ocean.

Apollo 12 launched from Cape Kennedy on Nov. 14, 1969, into a cloudy, rain-swept sky. The flight plan for Apollo 12 was similar to that of Apollo 11, except Apollo 12 was to fly a higher inclination to the lunar equator and leave the free-return trajectory after the second translunar midcourse correction. Prior to lunar orbit insertion, a telecast was made to Earth on Nov. 17, showing the Earth, moon, spacecraft interior and intravehicular transfer of the crew. Later that day, when Apollo 12 went behind the moon at about 97 miles up, the first lunar orbit insertion burn began. The burn lasted for about six minutes, placing the spacecraft into an elliptical orbit of 69 by 195 miles. On Nov. 19, with the LM behind the moon in the 14th orbit, and some 109 hours, 23 minutes into the mission, the descent orbit insertion maneuver began. With Conrad controlling the descent semi-manually for the last 500 feet, a precision landing occurred at about 110 hours, 32 minutes into the mission, and closer to the target than expected. Intrepid landed in the Ocean of Storms at 3 degrees, 11 hours, 51 minutes south, and 23 degrees, 23 minutes, and 7.5 seconds west. Landing was about 120 feet northeast of Head Crater, and about 535 feet northwest from where Surveyor III stood in its crater. Apollo 12 touched down approximately 950 miles west of where Apollo 11 had landed. Three hours after the landing and before the first extravehicular activity or, EVA, began. Richard Gordon, orbiting 69 miles up in the Yankee Clipper, was able to see both the Intrepid and Surveyor through the use of a 28-power sextant telescope. Conrad opened Intrepid's hatch at 115 hours, 10 minutes into the mission to begin the first lunar EVA for the Apollo 12 crew. In their first lunar exploration, Conrad spent three hours, 39 minutes outside Intrepid, and Bean logged two hours, 58 minutes on the lurain. Crew Charles Conrad Jr., Commander Alan L. Bean, Lunar Module Pilot Richard F. Gordon Jr., Command Module Pilot