Image - on Mars
Image Source - http://mars.jpl.nasa.gov/msl-raw-images/msss/00907/mcam/0907MR0039700460501417C00_DXXX.jpg
This image was taken by Mastcam: Right (MAST_RIGHT) onboard NASA's Mars rover Curiosity on Sol 907 (2015-02-23 23:35:47 UTC).
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Explanation - This is NASA Curiocity Rovar's wonderful image. Many pictures from Curiocity are unexplained. This one is also surprised.
Commonly any stone has natural structures. But this stone is unique. It has special design in two sides. It has carvings in the middle and it appears that it was broke down from other big structure.
NASA did not give details about it. Let this mystery continue to future.
