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 distant, icy world has just been added to our solar system’s official roster, and its strange orbit might challenge one of the biggest space mysteries of our time. According to a study published on ...

Simulations show that the stars’ tug could send Mercury, Venus or Mars crashing into Earth — or let Jupiter eject our world from the solar system.

WASHINGTON: A group of scientists has found a strange new object about 435 miles wide at the far edge of the solar system. It ...

Billions of years from now, the Sun will swell into a red giant, swallowing Mercury, Venus, and Earth. But that’s not the ...

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

Six known objects in the Kuiper Belt have elliptical orbits ... objects from the Kuiper Belt orbit in the opposite direction from everything else in the solar system, according to NASA.

Scientists have discovered a colossal object approximately 435 miles wide in the frigid outer reaches of our solar system, ...