It's been 10 years since Pluto was reclassified as a dwarf planet. But no matter the label, it and its dwarf planet cousins continue to stun researchers with their complexity.
Space physicists say that Pluto's atmosphere interacts with the solar wind in a never-before-seen hybrid way, one that's both comet-like and planet-like.
New evidence of ice volcanoes and of middle-aged terrains on Pluto's surface suggests that the dwarf planet has remained geologically active ever since it first formed billions of years ago.
Strangely speedy rotation rates of Pluto's tiny orbiting companions show up in a trove of images taken as the New Horizons spacecraft approached the dwarf planet last spring and early summer.
Pluto is the most distant object visited by a spacecraft, yet exploration of the Solar System is far from complete.
Scientists are amazed by new images that show Pluto's atmosphere and diverse geology.
When the New Horizons spacecraft photographed Pluto last week, it snapped the most revealing images yet of two little-known moons of the dwarf planet.
The mottled plain offers additional evidence that Pluto's surface is geologically young—and possibly still active.
Scientists struggle to explain perplexing features revealed by the first close-up of the icy body's surface.
Successful flyby of Pluto completes the first era of planetary reconnaissance, NASA Administrator Charles Bolden says.