NASA’s PersVership Rover has discovered a mysterious skull -shaped stone on Mars. On April 7, NASA, a US space research agency, took a picture of a strange stone called ‘Scal Hill’ on the edge of Jejero Crater on Mars.

As seen in the picture, the stone is very darker and the skull -like shaped opposite the dust and light -colored rock. Its structure is angular and it contains many small holes, which may be formed under the influence of natural erosion or meteorite.

According to NASA, the structure and color of the stone are compatible with some meteorite stones discovered in the Gayle Creta by the previous Curocyti Rover. It can provide important information in search of the geological history of Mars and the source of the unknown rock on its surface.

Experts believe that stones like Scall Hill are gradually eroded by the friction of the wind or the sand storm. NASA says they will now conduct further research to analyze the chemical material of the stone and determine the possible source.

Meanwhile, curiosity and discussion among the common people see the shape of the scal heel. Many people think that it is the result of the mental reaction called Predolia, where people are able to recognize the familiar appearance even in the unknown.