“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 ...

The heat might be coming from a hidden ocean or radioactive elements beneath Pluto's surface. This would be a real turn-up for the books as, until now, astronomers thought Pluto was too old to ...

For some reason, after a short pause, I said, ‘Why not call it Pluto?’ I did know, I was fairly familiar with Greek and Roman legends from various children’s books that I had read ...