Pluto's 2006 status change from planet to dwarf planet is still a sore subject for many, including a fourth grader in Tampa, ...

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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 ...

The Artemis II mission, which took four US astronauts around the Moon and to a record-breaking distance from Earth, was a ...

Classifying things in science is always fraught with the potential for uncertainty. Even things that are obviously different, ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the existence of a theoretical Planet Nine.

WASHINGTON (Reuters) -Astronomers using the Hubble Space Telescope have observed a white dwarf - a highly compact stellar ember - that appears to have gobbled up an icy world akin to the dwarf planet ...

Astronomers searching for the faintest glimmers of light beyond distant Pluto say they’ve discovered a new dwarf planet – and that this planetoid’s movements hint that an invisible giant planet ...

"Please make Pluto a planet again. I really want it to be a planet again," Kayla begins, eliciting a response from the NASA ...

A giant planet in the HR 8799 system orbits six times faster than its neighbor, reigniting the mystery surrounding its origin ...

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An international team including the University of Bern (UNIBE) and the University of Geneva (UNIGE), members of the National ...