NASA Photographed a Giant Patch of Moon-Like Rock on Earth — And It's 600 Million Years Old

From 400 kilometres above Earth, an astronaut aboard the International Space Station looked down at Madagascar and saw something that did not quite belong: a bright, almost perfectly circular patch of pale rock glowing against the dark, twisted terrain around it. It looked like a piece of the Moon had been dropped onto Earth. In a way, that is not far from the truth.

The formation is the Saririaky anorthosite massif, a vast body of ancient rock in southern Madagascar made of the same material that forms much of the Moon's bright highlands. NASA's Earth Observatory published the astronaut's photograph on 5 October 2026, and it has since become one of the most striking space images of the year — a reminder that the boundary between Earth geology and lunar geology is thinner than most people imagine.

A Photograph Taken From the Space Station

On 28 August 2026, a member of the Expedition 75 crew photographed the massif from the International Space Station. The image, catalogued as ISS075-E-85249, was taken with a Nikon Z9 camera and a 400-millimetre lens, then cropped and adjusted for contrast by NASA's Earth Science and Remote Sensing Unit.

What makes the photograph so arresting is the contrast. The Saririaky massif covers roughly 100 square kilometres (40 square miles) of exposed rock, and its pale surface stands out sharply against Madagascar's dry, rugged landscape. From orbit, the roughly circular feature is impossible to miss.

What Exactly Is Anorthosite?

Anorthosite is an intrusive igneous rock, which means it forms when molten material cools and solidifies slowly beneath the Earth's surface, allowing relatively large mineral crystals to grow. On the Moon, it is everywhere: anorthosite makes up much of the bright, reflective highlands that are visible from Earth with the naked eye.

On Earth, it is far less common, but it does occur in a handful of places — eastern Canada, Scandinavia, southern India, and Madagascar. Geological research suggests the Saririaky massif originated during the late Precambrian, making it at least 600 million years old. It has been sitting there, exposed to the sky, since long before the first fish crawled onto land.

A Scar Left by a Supercontinent

The rocks around Saririaky tell an even older story. Geologists have identified the massif as lying within a ductile shear zone, a region where rocks were gradually stretched and distorted under intense heat and pressure. The surrounding rocks were metamorphosed by the process, producing long, roughly parallel patterns that run from north to south across the landscape.

Scientists believe this dramatic deformation happened during the assembly of Gondwana, the enormous supercontinent that once joined landmasses now separated by oceans. As parts of present-day Africa, India, Madagascar, Australia, and Antarctica collided, the pressure deformed everything caught between them. Some researchers have even suggested that a second anorthosite massif, about 60 kilometres to the north in the same shear zone, was once connected to Saririaky before the collision stretched and pulled the original body apart — a process geologists call boudinage.

Why Moon Scientists Care About a Rock in Madagascar

The real value of Saririaky goes beyond its looks. The Moon's own anorthosite-rich highlands are more than 4 billion years old, formed when the young Moon was covered by a vast ocean of molten rock. As that magma cooled, anorthosite crystallised and became a major part of the lunar crust.

Apollo astronauts brought lunar anorthosite samples back to Earth, but those samples are limited in quantity. To understand the Moon's earliest history, scientists also study similar formations on Earth — and few are as useful as the ones in Madagascar. The closest compositional match to lunar anorthosite, NASA notes, is found in Montana's Beartooth Mountains, but Saririaky offers a rare large-scale example of how the same kind of rock behaves on a planetary surface over hundreds of millions of years.

That is the deeper point of the photograph. Earth and the Moon are often treated as separate worlds, but the rocks tell a shared story — the same minerals, the same cooling magma, the same ancient processes. The bright circle in southern Madagascar is not a piece of the Moon. It is proof that Earth still carries the Moon's geology in its own crust.

Read more on Global Insight: NASA's Moon base plans explain why the lunar highlands matter for the next era of exploration; our report on the transparent-headed barreleye fish shows how rare first-ever footage reshapes science; and the Japan earthquake report covers how Earth's crust is still moving today.

Sources: SciTechDaily and Earth.com, reporting NASA Earth Observatory's astronaut photograph ISS075-E-85249.