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Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for ...

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

NASA Administrator Jared Isaacman has reiterated his support for Pluto to be reclassified as a planet. Pluto was downgraded ...

Astronomers have discovered a possible new dwarf planet orbiting far beyond Pluto. First detected in March 2023 by Japan's Subaru Telescope in Hawaii, this object has been dubbed 2023 KQ14 and ...

NASA chief Jared Isaacman said at a US Senate hearing that he supports restoring Pluto's status as a planet after a ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

Citizen scientists working with NASA have helped identify more than 3,000 brown dwarfs—dim, elusive objects that sit between ...

A possible cousin of Pluto seems to be circling the far reaches of the solar system. The dwarf planet candidate 2017 OF201 travels in a superwide orbit, with the sun relatively near one end of its ...

Our solar system is much like a trail of microcosmic breadcrumbs: Follow the molecular bits as far back as they go, and you'll learn a thing or two about where many of our planets and other celestial ...

A rare type of plutonium has been found in the crust below the deep sea, offering new clues as to how heavy metals form in star explosions and mergers. Strange hexagonal diamonds may have been ...