Astronaut Alex Gerst captured from ISS Tenoumer Crater, Mauritania in Sahara Desert.

Credit: Alex Gerst, ESA, NASA

Deep in the Sahara Desert lies a crater. Nearly a perfect circle, Tenoumer Crater is 1.9km diameter, and sports a rim 100m high. The crater sits in a vast plain of rocks so ancient they were deposited hundreds of millions of years before the first dinosaurs walked the Earth. Closer examination of the structure revealed that the crater’s hardened “lava” was actually rock that had melted from a meteorite impact.

The local scenery on the ground is as follows.

Credit: SaharaMet, R. Pelisson

Reference: Alex Gersts’s Tweet
See earthview photo gallery: LiVEARTH