SUNSET: 
The Decade-long Hunt for Arrokoth, a Strange New World in the Outer Solar System
Almost 10 years ago, New Horizons finally zipped by Pluto, returning fantastic images. But then it needed a new destination.
Solved: The Case of the Universe’s “Extra” Light
Astronomers may have finally solved the mystery of how dark space really is.
A Cosmic Arrow Pierced Pluto's Heart — Is It Still There Beneath the Surface?
A giant impact likely formed Pluto's heart-shaped basin, Sputnik Planitia. A big chunk of the impactor’s core might still be buried under the ice.
New Horizons Discovers Kuiper Belt "Twins"
New Horizons has spotted two asteroid pairs in the outer solar system. Their existence sheds light on how planets formed.
Plutonian Mounts Aren’t Ice Volcanoes
Careful study of data from the New Horizons mission indicates that an iconic, caldera-looking feature isn’t what it seems.
What New Horizons Found in Deep Space — And Why It Matters
NASA’s mission to the outer solar system has found more light than expected. That could mean more galaxies in the visible universe than we thought— or less, depending on who you talk to.
How Did Pluto's Moons Form?
A massive collision with Pluto’s moon Charon could have formed the dwarf planet’s collection of smaller moons.
New Horizons' "Alien View" from the Outer Solar System
NASA's New Horizons mission deep in the Kuiper Belt has measured the parallax to two nearby stars with the help of Earth-based observers.
Did Pluto Harbor an Ancient Subsurface Ocean?
New studies shed light on the early years of Pluto's formation, and whether it ever hosted a subsurface ocean.
New Horizons Recruits Amateurs to Sight Stars
The New Horizons team wants you to help measure the distance to two stars, yielding the longest-ever baseline measurement of a key cosmic yardstick.
Pluto's Icy Heart "Beats," Driving Planet-Scale Winds
New computer simulations suggest that the "beating" of Pluto's frozen heart drives weak winds on this remote world in the outer solar system.
Pluto and Charon Are Missing Small Craters
Scientists studying New Horizons images of craters on Pluto and its moon Charon have found that the Kuiper Belt must contain fewer small objects than expected — which suggests the outer solar system hasn’t changed much since its earliest days.
Initial Results from the Ultima Thule Flyby
NASA's New Horizons made history when it flew by "Ultima Thule" on New Year's Day, but the science return is only beginning. Here's the latest from mission principal investigator Alan Stern.
New Horizons: Ultima Thule is Dead Ahead
Ultima Thule, the next target for the New Horizons mission, is getting ever bigger within the spacecraft's sights. Alan Stern brings us the latest update on preparations for the New Year's Day flyby.
Planning the New Horizons Exploration of Ultima Thule
Alan Stern, principal investigator of NASA's New Horizons mission, gives a detailed preview of what the spacecraft will be doing in the days up to, during, and after the impending flyby of the Kuiper Belt Object 2014 MU69.
New Horizons On Approach to the First Exploration of a Kuiper Belt Object
Take a look behind the scenes as the New Horizons team gears up for the historic first flyby of a body in the remote Kuiper Belt, in this first of a four-part series from the mission's Principal Investigator Alan Stern.
Dunes on Pluto
Planetary scientists think they’ve found wind-built ripples of methane ice on the king of the Kuiper Belt.
Does New Horizons’ Target Have a Moon? (Update: Nope)
New analysis from the New Horizons team suggest that the spacecraft's next target in the Kuiper Belt might have a third companion.
Alan Stern: The Exploration of Pluto
Alan Stern discusses the New Horizons flyby of Pluto in July 2015 and what ongoing analysis continues to reveal about this fascinating world.
The Frozen Plain of Pluto
New images from NASA's New Horizons spacecraft reveal an ice-covered plain on Pluto that looks remarkably young and fresh.
