Makemake Moon

Explanation: This Hubble image reveals the first moon ever discovered around the dwarf planet Makemake. The tiny satellite, located just above Makemake in this image, is barely visible because it is almost lost in the glare of the very bright dwarf planet. Hubble's sharp-eyed WFC3 made the observation in April 2015. The observing team used the same Hubble technique to observe the moon as they did for finding the small satellites of Pluto in 2005, 2011, and 2012.

Pluto

Image credit: NASA, ESA, and A. Parker and M. Buie (SwRI)