Pluto's moon Charon may have once spun once every 14 hours, and its ancient mountains still record how it slowed down

The brief

For decades, Charon was often viewed as the quieter half of the Pluto system, a frozen world marked by craters, fractures and vast plains. Yet the surface photographed by NASA’s New Horizons spacecraft has continued to reveal hints that its history w... [4907 chars]