Astronomy
The Geological Evolution of Pluto's Heart-Shaped Glacier
Quick fact
NASA's New Horizons spacecraft revealed that Pluto's famous 'heart' is actually a massive glacier of nitrogen ice, filling a deep impact basin. This glacier is actively churning, with slow convection cells overturning its surface every few hundred thousand years.
Why this is interesting
You probably know Pluto as a tiny, frozen planet—so how can it have a heart-shaped glacier that flows and churns like a living thing?