For generations Pluto stood as the mythic ninth planet until a scientific revolution shattered that legacy and transformed it ...

New Horizons exposed Pluto as a surprisingly active world shaped by towering ice mountains, cryovolcanoes that erupt frozen mixtures instead of lava, and a possible hidden ocean sealed beneath a deep ...

"The surfaces of Nix and Hydra are as close to unaltered as you can get." Two of Pluto's midsize moons may be made of the guts of its largest moon, Charon, new research suggests. New observations with ...

"'Oumuamua is in a different category of object. It's much harder to find, but there are a lot more of them." The first interstellar object to visit the solar system may have been a fragment of an icy ...

Preface: Inside the farthest exploration in history -- Introduction: Out of lock -- Dreams of a grand tour -- The Pluto underground -- Ten years in the wilderness -- The undead -- New Horizons at last ...