Dwarf planet Makemake, which orbits the sun once every 310 Earth-years, has a dark little moon. Just 100 miles across, the moon evaded detection for more than a decade, hiding in the glare of its parent planet. But it couldn’t escape the stare of the sharpest eye in the sky forever: When scientists aimed the Hubble Space Telescope at Makemake for more than two hours in April 2015, they discovered a faint point of light moving through the sky along with the icy world. Until now, Makemake was the only officially recognized distant dwarf planet without a moon, a dubious distinction that has now been lost.
Scientists Discover a Dark Moon in the Distant Solar System
