Pluto nearly fills the frame in this image from NASA's New Horizons spacecraft. The image was taken on July 13, 2015, when the spacecraft was 476,000 miles (768,000 kilometers) from the surface.

NASA unveiled more discoveries about Pluto Friday from the data that's begun trickling back after this week's historic fly-by.

NASA's New Horizons spacecraft captured this high-resolution enhanced color view of Pluto on July 14, 2015.

For decades, Pluto remained one of the most mysterious objects in our solar system, until July 14, 2015, when NASA's New Horizons spacecraft became the first mission to visit it up close ...