Named 'Marshenge', alien enthusiasts have been comparing it to the famous stone circle at Stonehenge in Wiltshire, England.<br /><br />It was originally imaged by by the Mars Reconnaissance Orbiter on September 24, 2012 at 3:29 p.m. local time in Nilosyrtis Mensae (28.064°N, 75.956°E).<br /><br />The original-image can be downloaded here - watch out its a .jp2 of 681mb<br />hirise-pds.lpl.arizona.edu/download/PDS/RDR/ESP/ORB_028800_028899/ESP_028891_2085/ESP_028891_2085_RED.JP2<br /><br />This formation is impressive with Marshenge-hill being approximately 359 pixels in diameter, and the stone “circle” is about 188 px, translating to 90 meters and 47 meters respectively.
