Theoretical physics: The origins of space and time. Many researchers believe that physics will not be complete until it can explain not just the behavior of space and time, but where these entities come from.
First Colour Images of Pluto and Charon: in colour, bronze with unusual markings, getting closer. Charon much darker. New Horizons Color Images Reveal Two Distinct Faces of Pluto, Series of Spots that Fascinate: July 2015