Apollo 16

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The Apollo 16 landing site is in the region around Descartes crater in the lunar highlands. 

The landing spot was chosen to allow the astronauts to gather geologically older lunar material than the samples obtained in the first four landings, which were in or near lunar maria (Descartes and Cayley Formations).

The mission lasted 11.1 days, with a stay on the lunar surface of 71 hours. The crew were on the lunar surface for 20.2 hours during which they traversed approximately 27 kilometers and collected approximately 96 kilograms of samples.

Apollo 16 was launched on April 16th 1972.

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When you look at the Moon on a clear night with the naked eye, you can see colour variations. The overall pattern that they make is sometimes called ‘the man in the Moon’ because some people think they see a face. The lighter areas are the highlands and the darker areas are maria (mare is the singular form).

The lunar highlands represent the original lunar crust, as seen in the previous step. The oldest highland rocks are more than 4.15 billion years old and sometimes as old as 4.4 billion years, which is older than any rock found on Earth. They are mainly anorthosite, but also include dunite and gabbro with increasing depth. These are the oldest rocks on the Moon and are evidence for a magma ocean, as discussed earlier.

In contrast, the maria are basins filled in with basalt and were formed mostly between roughly 3.0 and 3.5 billion years ago. However, there are some small patches that are thought to be as young as around 1.0 billion years. The mare basalts are secondary to the Moon’s formation, in the sense that they did not form from the magma ocean stage like anorthosite, but by later heating and melting of the mantle in the same way that volcanoes are formed on Earth.

Two other types of deposit are found on the surface of the Moon:

regolith: the crushed remains of other rock types that coat much of the surface
breccia: a rock formed of regolith that has been welded together at high temperature and pressure.
Regolith is the mixture of dust, mineral fragments and rock fragments that lies on the surface. Breccia is formed in the explosions when large asteroids hit the Moon.

The Moon has no atmosphere, so even the smallest meteorites just millimetres across reach the surface and form craters. (Such meteorites are called micrometeorites.) Some of the Moon rocks returned to Earth by the Apollo astronauts have small pock marks formed when tiny particles hit them. Each is filled by a thin layer of rock that melted in the impact and then re-solidified.

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Apollo 16 crew: Thomas Mattingly, John Young & Charles Duke (courtesy of NASA)
Apollo 16 lunar module and rover (courtesy of NASA)
Apollo 16 lunar module pilot Charles Duke at Plum Crater (courtesy of NASA)
Apollo 16 lunar module on its return to Earth (courtesy of NASA)
Apollo 16 lunar module post flight (courtesy of NASA)
Apollo 16 sample location map (top)
Apollo 16 sample location map (bottom)

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When you look at the Moon on a clear night with the naked eye, you can see colour variations. The overall pattern that they make is sometimes called ‘the man in the Moon’ because some people think they see a face. The lighter areas are the highlands and the darker areas are maria (mare is the singular form).

The lunar highlands represent the original lunar crust, as seen in the previous step. The oldest highland rocks are more than 4.15 billion years old and sometimes as old as 4.4 billion years, which is older than any rock found on Earth. They are mainly anorthosite, but also include dunite and gabbro with increasing depth. These are the oldest rocks on the Moon and are evidence for a magma ocean, as discussed earlier.

In contrast, the maria are basins filled in with basalt and were formed mostly between roughly 3.0 and 3.5 billion years ago. However, there are some small patches that are thought to be as young as around 1.0 billion years. The mare basalts are secondary to the Moon’s formation, in the sense that they did not form from the magma ocean stage like anorthosite, but by later heating and melting of the mantle in the same way that volcanoes are formed on Earth.

Two other types of deposit are found on the surface of the Moon:

regolith: the crushed remains of other rock types that coat much of the surface
breccia: a rock formed of regolith that has been welded together at high temperature and pressure.
Regolith is the mixture of dust, mineral fragments and rock fragments that lies on the surface. Breccia is formed in the explosions when large asteroids hit the Moon.

The Moon has no atmosphere, so even the smallest meteorites just millimetres across reach the surface and form craters. (Such meteorites are called micrometeorites.) Some of the Moon rocks returned to Earth by the Apollo astronauts have small pock marks formed when tiny particles hit them. Each is filled by a thin layer of rock that melted in the impact and then re-solidified.