NASAさんのインスタグラム写真 - (NASAInstagram)「"The living history of the Earth jumps out at you through buckles, folds, giant fans," wrote astronaut Nick Hague (@astrohague) about his photo of the "Eye of the Sahara" from the International Space Station (@ISS). Scroll through for more images of this striking geologic feature, the Richat Structure of Mauritania, captured by astronauts on the station and @NASAEarth satellites. ⁣ ⁣ Located in the Sahara Desert, it measures 28 miles (45 kilometers) across and is made up of igneous and sedimentary rocks. It's thought to be caused by an uplifted dome that has been eroded to expose the originally flat rock layers.⁣ ⁣ #mauritania #sahara #desert #richatstructure #geology #earthart #spaceart⁣ ⁣ 1) Photograph taken from the International Space Station, Sept. 2019. The image has been enhanced to improve contrast. Image Credit: NASA⁣ 2) ASTER Mission image from Oct. 7, 2000. Image Credit: NASA/METI/AIST/Japan Space Systems and U.S./Japan ASTER Science Team⁣ 3) Landsat satellite image draped over an elevation model produced by the Shuttle Radar Topography Mission (SRTM); February 2000 (SRTM), January 13, 1987 (Landsat). Image Credit: SRTM Team NASA/JPL/NIMA⁣ 4) Landsat-7 satellite image from Jan. 11, 2001. Image Credit: NASA/U.S. Geological Survey/Landsat-7/Goddard Space Flight Center⁣ 5) Photograph taken from the International Space Station, Dec. 17, 2011. Image Credit: NASA」9月18日 4時15分