NASA’s astronaut photograph shows the Saririaky anorthosite massif in southern Madagascar: an ancient Earth formation made of a rock type common in the Moon’s bright highlands. It is not lunar material. NASA estimates the exposed outcrop covers about 100 square kilometers (40 square miles) and formed at least 600 million years ago.
Where is the Moon-like rock in Madagascar?
Saririaky lies in southern Madagascar, where its bright, roughly circular outcrop stands out against the surrounding dry landscape. NASA Earth Observatory published the astronaut photograph on October 5, 2026, identifying the feature as the Saririaky anorthosite massif.
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Anorthosite is an intrusive igneous rock: magma cooled and solidified underground, giving relatively large crystals time to form. Anorthosite also occurs in eastern Canada, Scandinavia and southern India.
Why does it resemble the Moon?
Anorthosite is abundant in the Moon’s bright, reflective highlands. NASA says lunar anorthosites are more than 4 billion years old and formed as the Moon’s early magma ocean cooled and minerals accumulated to build the crust. Saririaky is much younger by NASA’s estimate, and its terrestrial origin and formation history are not the same as the Moon’s.
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The useful comparison is the rock type, not an assertion that the Madagascar outcrop is an exact match for lunar material. NASA identifies anorthosite in Montana’s Beartooth Mountains as a particularly close compositional match to lunar anorthosite; it does not make that claim about Saririaky.
What do Apollo samples tell us?
Earth outcrops give scientists useful comparisons, but the direct evidence for lunar rocks comes from lunar samples and observations. Apollo 15 brought back sample 15415, an anorthosite nicknamed the Genesis Rock. NASA says geologists at the Manned Spacecraft Center later concluded it was about 4 billion years old.
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When the crew found it, Apollo 15 commander David R. Scott said: “Guess what we just found,” and then, “Guess what we just found! I think we found what we came for.” The sample is a concrete example of anorthosite from the Moon’s primordial crust—not a piece of the Saririaky massif.
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Saririaky sits within a ductile shear zone. NASA describes the surrounding rocks as having been reshaped under high pressure and temperature, leaving north–south-trending linear patterns. Geologists associate much of this deformation with ancient landmasses colliding during the assembly of Gondwana.
Another anorthosite massif lies roughly 60 kilometers (about 40 miles) to the north. Some researchers have proposed that it was once joined to Saririaky and later separated as tectonic stretching pulled the rock apart, a process called boudinage. NASA presents this former connection as a proposal, not a settled conclusion.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How was the ISS photograph made?
A member of the Expedition 75 crew aboard the International Space Station took the photograph on August 28, 2026. NASA identifies it as image ISS075-E-85249, taken with a Nikon Z9 digital camera and a 400-millimeter focal-length lens. The ISS Crew Earth Observations Facility and NASA Johnson Space Center’s Earth Science and Remote Sensing Unit provided the image.
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NASA says the photograph was cropped and contrast-adjusted, and lens artifacts were removed. It is an astronaut photograph processed for presentation, rather than an untouched camera image.
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Sources
- NASA Earth Observatory, “Moon-Like Madagascar” (October 5, 2026): location, geology, image details and interpretation.
- NASA Science, “Genesis Rock” (published September 22, 2017; last updated October 22, 2024): Apollo 15 sample context.
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