A recently discovered celestial body is rewriting our knowledge of the Kuiper Belt and maybe challenging the existence of the ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

The newly discovered object, named 2017 OF201, has a 25,000-year orbit and is believed to be a large contender for dwarf ...

However, as scientific understanding evolved, so did Pluto's classification — though not without controversy. Pluto fails the ...

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 ...

And so this argument, I think that doesn't hold much water. So classification wise, I am completely comfortable calling Pluto a planet, the moon a planet. BARBER: Europa, one of Jupiter's moons ...

the International Astronomical Union stripped it of its original classification, after narrowing the definition of a planet to be one that clears its orbit with its gravitational heft. Pluto doesn ...

Pluto was a victim of its location ... dozens of different kinds of beetles," van Belle said. "Why not several classifications of planets?" For those who insist the Big 8 belong in a class ...