Pluto's Escaping Atmosphere

Explanation: A schematic diagram showing potential flow patterns in Pluto's escaping atmosphere. This diagram is based on computer models that show that some of Pluto's escaping atmosphere is captured by Charon's gravity, creating a tenuous atmosphere around Charon which - if confirmed by New Horizons - can be used to help diagnose the escape rate from Pluto.

Pluto

Image credit: Mike Summers, George Mason University.