Space

Madagascar is a moon-like planet.

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Briefings

An astronaut photographed Saririaky anorthosite massif on Madagascar on August 28, 2026, revealing a 100-square-kilometer igneous rock formation resembling lunar highlands. The massif formed in the late Precambrian, likely during the collision of Gondwana, and features north-south shear zones. It is the only known terrestrial anorthosite massif matching lunar composition, though limited sample data from Apollo missions complicates direct comparison. The image was captured from the ISS using a 400mm lens.

Key points

• The Saririaky anorthosite massif on Madagascar is the only known terrestrial anorthosite matching the lunar composition, forming a 100-square-kilometer igneous rock formation visible from Earth.
• The massif lies within a ductile shear zone where high pressures and temperatures metamorphosed the rock, creating north-south-trending linear patterns associated with the collision of Gondwana.

Context and limitations

Direct comparison with lunar anorthosites is limited by the scarcity of Apollo-era samples; the Saririaky massif's Precambrian age is estimated at least 600 million years old, but precise crystallization timing remains uncertain.

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