In a photo taken by the rover Curiosity on its 3,709th day on Mars, a strange rock spotted in the upper right of the image has NASA experts puzzled. The rock of unusual grey color is sitting atop the reddish bedrock.
"Pau Baru" - as the rock was named - could be a meteorite fragment or a pebble of a different rock formation, transported by wind or water to its actual position. The team operating the rover will try to analyze Pau Baru in the coming days to determine its composition and possible origin.
Source: Forbes