Nasa unveils 'surprise' Pluto photos and New Horizons discoveries – as it happened

Team at Nasa unveils and describes new high-resolution photographs and data sent back to Earth from the New Horizons spacecraft of Pluto and its moons

4.19pm ET

We're going to close our live coverage of the New Horizons mission to Pluto with a quick summary of Nasa's most recent revelations from the edge of our solar system.

4.02pm ET

There's something about these two worlds that's "very very different," Stern says. One has an atmosphere, the other doesn't, one is covered in water ice, the other in volatiles (a category of active chemicals).

"It's a puzzle, it's a real puzzle."