“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

I’ve been thinking about Pluto. Poor old Pluto. Sad face emoji for Pluto. When I was a boy reading books about the Solar System, there was Pluto at the edge of the double-page spread in the ...

This would be a real turn-up for the books as, until now, astronomers thought Pluto was too old to have retained enough heat energy to have these processes occurring. It might mean all sorts of ...