Remmants of Atmosphere Discovered on Dwarf Planet

In an article in The Daily Galaxy - I read that scientists at California Institute of Technology

• have discovered that the dwarf planet 2007 OR10 is an icy world, with about half its surface covered in water ice....

This suggests that:

• the planet may be covered in a thin layer of methane, ... remnants of an atmosphere
  

There is also evidence that this ancient frozen atmosphere is being slowly lost to space.

The planet, dubbed "Snow White" was discovered in 2007 and orbits the sun at the very edge of the Solar System and is about half the size of Pluto, making it the fifth largest dwarf planet.

Read the complete article here