Mercury's Caloris Basin (high-pass filtered)

Mercury's Caloris Basin (high-pass filtered)
Mercury's Caloris Basin (high-pass filtered) The Caloris Basin is one of the largest basins in the solar system at approximately 1,300 kilometers (800 miles) in diameter. Only half of it was seen by Mariner 10 as it sped past Mercury in 1974. This view was "high-pass filtered" to remove the brightness and darkness effects of the solar illumination angle, to better emphasize topographic features. Scale: 1000 meters per pixel. Created: 29 March 1974. NASA / JPL-Caltech / Mark Robinson