Researchers believe that 2017 OF201’s highly eccentric orbit points to a chaotic origin, possibly caused by a gravitational ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

Upon the discovery of its existence in 1930, Pluto enjoyed ... Just like there are binary stars, Lyra says Earth and its moon would newly be considered a binary planet system.

They did, and the discovery of Planet X was announced on March ... with nitrogen and methane in the atmosphere. 5 - Pluto has an ionized tail like a comet — probably from nitrogen from its ...

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

A newly detected planet beyond Pluto is not just expanding our understanding of the Solar System, it might be quietly rewriting it. Astronomers from the University of Taiwan recen ...

There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be fair—but one of the largest yet discovered and with an orbit around the Sun that ...

Instead of a typical planet-moon setup ... This idea worked for Earth, but icy worlds like Pluto didn’t fit the same mold. Pluto and Charon are too cold and too small for that molten chaos.

Pluto's discovery was widely celebrated ... "In some ways, Pluto's more of a planet than some of the other established ...