Planet Nine: 'Insensitive' Term Riles Scientists
Pluto, once considered the ninth and most distant planet from the sun, is now the largest known dwarf planet in the solar system. It is also one of the largest known members of the Kuiper Belt, a shadowy zone beyond the orbit of Neptune thought to be populated by hundreds of thousands of rocky, icy bodies each larger than 62 miles (100 kilometers) across, along with 1 trillion or more comets.
One new children's book takes readers on a journey to Pluto with NASA's New Horizons spacecraft.
Scientists have discovered 12 previously unknown moons orbiting Jupiter, and one of them is a real oddball.
This week, the small and distant dwarf planet Pluto will reach opposition, the time of the year when the object is closest to Earth and brightest in the sky. Here's how to track it with mobile apps.
Forty years ago, Pluto's largest moon Charon was discovered.
Scientists have put together new maps of Pluto and its moon Charon, showing the peaks and valleys of their surfaces in incredible detail.
NASA's New Horizons spacecraft has woken up from hibernation to prepare for a historic New Year's Day flyby.
Pluto has an extensive dune system, but the grains that make up the wind-blown mounds are certainly not sand, a new study reports.
Pluto may have long ago coalesced from 1 billion or so comets, a new analysis of data from NASA's New Horizons mission and the European comet-orbiting Rosetta probe suggests.
The long-simmering argument about Pluto's planethood has just flared up again.
In "Chasing New Horizons" (Picador, 2018), Alan Stern and David Grinspoon trace the many obstacles faced by NASA's New Horizons mission to Pluto — both before and after launch.
The names of explorers and the authors of journeys make up some of the first feature names for Charon.
A thick, gooey, asphalt-like layer could lie beneath Pluto's crust.
If you needed another reminder that a historic deep-space encounter is just around the corner, well, here you go.
New Horizons, which famously zoomed past Pluto in July 2015, is set to cruise by a small object called 2014 MU69 in the wee hours of Jan. 1, 2019.
There may be a lot more potentially habitable worlds zooming through the cold depths of deep space than scientists had thought.
Hydrocarbon particles in Pluto's atmosphere are responsible for the dwarf planet's surprisingly low temperatures, a new study suggests.
You have the chance to hang a nickname on the small, distant object that NASA's New Horizons spacecraft will zoom past on Jan. 1, 2019.