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Apollo 17
Missions to the Moon
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Apollo 17
Apollo 17 Mission to Earth's Moon

Mission Type: Lander, Orbiter, Sample Return
Launch Vehicle: Saturn V
Launch Site: Kennedy Space Center launch complex 39A
NASA Center: Kennedy Space Center
Spacecraft Mass: 30,320 kg (66,844 pounds)
Spacecraft Instruments:
Lunar Surface Experiments:
Apollo Lunar Surface Experiments Package (ALSEP)

  • Heat Flow Experiment
  • Lunar Ejecta and Meteorites
  • Lunar Seismic Profiling
  • Lunar Atmospheric Composition
  • Lunar Surface Gravimeter
Lunar Field Geology Cosmic-Ray Detector (sheets)
Lunar Gravity Traverse
Soil Mechanics
Surface Electrical Properties
Lunar Neutron Probe
Lunar Sample Analysis
Long-Term Lunar Surface Exposure

Earth Orbit and Lunar Orbit Experiments:
Gamma-Ray Spectrometer
S-Band Transponder (CSM/LM)
Far-Ultraviolet Spectrometer
Infrared Scanning Radiometer
Command Module Window Meteoroid
Lunar Sounder
CM Photographic Tasks
SM Orbital Photographic Tasks
Visual Observations from Lunar Orbit
NASA History Office
National Space Science Data Center

Apollo 17 was the sixth and final lunar mission in the Apollo program, but it was the first in which a scientist got to explore the moon firsthand. Harrison H. Schmitt was a geologist who had been part of the backup crew for Apollo 15. On Apollo 17, he served as pilot of the lunar module, "Challenger." Eugene A. Cernan was commander and Ronald E. Evans piloted the command module, "America."

On 11 December 1972, as Evans continued orbiting the moon, Cernan and Schmitt flew Challenger to a spot on the southeastern rim of Mare Serenitatis (the Sea of Serenity) between massive units of the southwestern Taurus Mountains south of Littrow Crater. Known as the Taurus-Littrow site, it was a flat-floored valley in a broken mountain chain. They touched down within 200 meters (650 feet) of the targeted landing point.

Their two primary objectives were to obtain highland samples older than the impact that had created the Imbrium Crater (the area Apollo 15 had explored) and to investigate the possibility of geologically recent, explosive volcanism. They succeeded spectacularly at both.

Rock-Solid Evidence

Among their haul was the oldest known unshocked (unaltered by meteorite impact) rock retrieved from the moon, a sample called Troctolite 76535, which NASA's Lunar Sample Compendium calls "without a doubt the most interesting sample returned from the moon!" It's believed to be at least 4.2 billion years old, and offers evidence that at one time, the moon, like Earth, had a magnetic field generated by a dynamo at its core.

The astronauts met their second goal with Schmitt's discovery of orange soil near Shorty crater. The color was due to orange and black volcanic glass which had formed in the type of explosive volcanic eruption known on Earth as a "fire fountain."

They remained on the lunar surface for 75 hours, the longest visit yet. With the help of their rover, they clocked 22 hours of EVA time during which they traveled some 36 km (more than 22 miles), ranging as far as 7.4 km (4.6 miles) from Challenger, just about at the limit of what was considered the walk-back distance if the rover failed during an excursion.

They deployed or conducted 10 science experiments, including the Apollo Lunar Surface Experiments Package (ALSEP) suite of instruments, took more than 2,000 photographs and collected about 110 kg (243 pounds) of soil and rock samples at 22 different sites.

The Final Farewell

At the end of the third and final EVA, Cernan and Schmitt televised the unveiling of a plaque on the lunar module, which read, "Here man completed his first exploration of the moon, December 1972 A.D. May the spirit of peace in which he came be reflected in the lives of all mankind." Cernan took mankind's final (to date) step off the moon at 5:40 UT on 14 December. They lifted off of the moon at 22:54 UT.

Challenger docked with America at 1:10 UT on 15 December. Some four hours later, the lunar module was jettisoned and subsequently sent crashing into the lunar surface at about 1.7 km per second (3,800 mph).

After another day and a half in lunar orbit, during which the astronauts released a subsatellite like the ones launched by Apollo 15 and 16, they fired their engine to return to Earth. En route, Evans conducted an hour-long spacewalk to retrieve camera and lunar sounder film from the Scientific Instrument Module bay.

The Apollo 17 capsule splashed down in the Pacific Ocean on 19 December 1972 at 19:24:59 UT (2:24:59 p.m. EST) after a mission elapsed time of 301 hrs, 51 mins, 59 secs. The splashdown point was 350 nautical miles (648 km) SE of the Samoan Islands and 6.5 km (4 mi) from the recovery ship USS Ticonderoga.

This was the second spaceflight for Cernan and the first for Evans and Schmitt. The backup crew for this mission consisted of John Young, Stuart Roosa and Charles Duke. Command module capsule America is on display at the Johnson Space Center in Houston, Texas.

Key Dates
7 Dec 1972:  Launch
10 Dec 1972:  Lunar Orbit Insertion
11 Dec 1972:  Lunar Landing
14 Dec 1972:  Lunar Surface Departure
19 Dec 1972:  Recovery on Earth
19 Dec 1972:  End of Lunar Mission
Fast Facts
Apollo 17 Facts Apollo 17 was the sixth and last crewed mission to the moon.

Harrison Schmitt was the first scientist to walk on the moon.

Apollo 17 was the first Apollo mission to launch at night.

This mission discovered evidence of past magnetic field generated by a dynamo at the lunar core.

Apollo 17 holds the record for longest time spent on the lunar surface and in EVAs on the surface.
People Spotlight
David S. McKay David S. McKay
During the Apollo program, McKay gave the first men to walk on the moon training in geology. Read More...
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Last Updated: 5 Sep 2013