New global map of Pluto

A new close-up image of Pluto from New Horizons reveals a vast, craterless plain that appears to be no more than 100 million years old. This frozen region is north of Pluto’s icy mountains, in the centre-left of the heart feature, informally named “Tombaugh Regio” (Tombaugh Region) after Clyde Tombaugh, who discovered Pluto in 1930.

The surface of Ceres, whose average diameter is 584 miles, is generally dark and similar in brightness to fresh asphalt. But the dwarf planet does possess 130 mysterious bright areas associated with impact craters that new research suggests are salt-rich areas left behind when briny water-ice from a subsurface layer sublimated in the past.

Within Pluto’s informally named Vega Terra region is a field of eye-catching craters that looks like a cluster of bright haloes scattered across a dark landscape. NASA’s New Horizons spacecraft has revealed that the floors and terrain between the craters show signs of water ice, but exactly why bright methane ice settles on these crater rims and walls is a mystery.