The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a ...

Familiar programming will ring in the New Year at the University of Wyoming Harry C. Vaughan Planetarium during January.

Charon is large in size relative to Pluto, and is locked in a tight orbit with the dwarf planet. A new simulation suggests how it ended up there.

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a ...

Using computer models, researchers studying Pluto and its moon, Charon, have discovered an unforeseen kind of cosmic ...

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New study reveals Pluto and Charon’s origin: a unique "kiss and capture" collision redefines how binary systems form.

With Charon being half Pluto’s size, experts have struggled to explain how it ended up in the dwarf planet’s domain. Now, a team of researchers has suggested that Pluto may have secured Charon ...

They rotate as one body until Pluto pushes Charon out into a stable orbit. "Most cosmic collisions are what we call a hit-and-run, when an impactor hits a planet and keeps going," Denton continued.

Planet X, also called Planet Nine, is a hypothetical planetary body seven times the mass of Earth lurking behind Pluto. If found, this gassy, icy beast some 155 billion miles away from the sun ...