Images taken by <a href="https://en.wikipedia.org/wiki/NASA" class="extiw" title="en:NASA">NASA</a>'s <i><a href="https://en.wikipedia.org/wiki/New_Horizons" class="extiw" title="en:New Horizons">New Horizons</a></i> probe of possible clouds in the atmosphere
NASA/SwRI
<a rel="nofollow" class="external free" href="https://www.nasa.gov/feature/secrets-revealed-from-pluto-s-twilight-zone">https://www.nasa.gov/feature/secrets-revealed-from-pluto-s-twilight-zone</a>