Pluto's “heart," which rests just above the planet's equator. It is estimated to be 1,000 miles across at its widest point.

The composite of enhanced color images of Pluto (lower right) and Charon (upper left), taken by NASA’s New Horizons spacecraft on July 14, 2015.

Pluto's blue high-altitude haze layer taken by the New Horizons Ralph/Multispectral Visible Imaging Camera (MVIC).

To see more photos of Pluto and Charon, visit https://www.nasa.gov/feature/new-horizons-top-10-pluto-pics.

For more information on New Horizons, visit https://www.nasa.gov/mission_p....

To see where the New Horizon’s spacecraft is now, visit http://pluto.jhuapl.edu/Missio....