I've always thought Pluto would be full of surprises - and the latest findings from the New Horizons mission are providing plenty.
Scientists are puzzled by the way Pluto's heart-shaped icecap always faces away from its largest moon, Charon. The latest theory is that there's a slushy ocean hidden under the icy surface. This would make the planet heavier on one side and could explain why Charon is in this 'tidally locked' orbit.
We still know so little about faraway Pluto, but I can't wait to see what else there is to learn.