NASA has spotted piles of stones on Mars that resemble structures found in the UK and elsewhere in Europe since prehistoric times.
Near the North Pole of the Red Planet, scientists have identified clusters of stones arranged in a linear order. NASA insists that it is not about alien structures.
"What could arrange the rocks in such an aggregate structure? In the Arctic on the Earth, rays are organized in one special process. Multiple freezing and defrosting of the ground can exfoliate the rocks on the surface and arrange them in the tracks, even in circles. On Earth, one of these temperature cycles lasts a year, but Mars can last much more, "they say about NASA.
Earlier this week, the US space agency was accused of covering up evidence of extraterrestrial life on Mars.
Barry Di Gregorio, a researcher at the University of Buckingham, found that NASA rover found traces of life on Mars, but the agency deliberately hides it from fear that there will be no budget for subsequent missions.