SPL RF Apr 2018

Illustration of a view of Pluto seen from the surface of its largest moon Charon. Because Pluto and Charon are tidally locked, they keep the same face towards each other at all times, as the Moon does to the Earth. So if one stood on Charon (or Pluto) the other world would stay fixed in the sky - never setting or rising, but still cycling through its phases. And if one were on the wrong hemisphere of Pluto (or Charon) one would never see the other world.