A Tiny, Icy World Beyond Pluto Could Have An Atmosphere That Makes No Sense
Rather than cleanly appearing, being hidden, and then reappearing in a kind of “blink” or “wink” illusion, the star appeared to fade slowly as it approached and left the cover of the plutino. That usually only happens when a plant has an atmosphere, as the gases change how the light is filtered.
Article source: https://www.huffingtonpost.co.uk/entry/atmosphere-pluto-scientist-discovery_uk_69fdade4e4b0cb033e5124a2