Craters of Nix and Hydra

Explanation: Crater measurements help scientists estimate the "age" of a planetary body's surface. These images of Pluto's smaller moons were taken by the Long Range Reconnaissance Imager (LORRI) and Ralph/Multispectral Visible Imaging Camera (MVIC) on the New Horizons spacecraft.

Pluto

Image credit: NASA/JHUAPL/SwRI