Washington: A close-up image of Pluto has revealed a vast, craterless plain - resembling frozen mud cracks on Earth - that appears to be no more than 100 million years old and is still being shaped by geologic processes.

This frozen region is north of Pluto-s icy mountains, in the centre-left of the heart feature named Tombaugh Region after Clyde Tombaugh who discovered Pluto in 1930.