Landsat

NASA's Earth Observatory highlighted the Richat Structure, a 40-kilometer-wide geologic formation in Mauritania, in its April 16, 2026, image of the day. Captured by Landsat 8 and Landsat 9 on March 5 and 6, 2026, the structure showcases concentric ridges formed by erosion, revealing a complex geological history shaped by natural forces over millennia.