When Mercury trines Pluto retrograde on May 27, you could have an unmistakable sense of “I can’t unsee this,” where you ...

The theory puts the planet at around the same size as Neptune, far past Pluto somewhere near the Kuiper Belt, where 2017OF201 was located. If it exists, it is theorized to have a mass of up to 10 ...

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.

Scientists are intrigued after spotting a highly unusual celestial object lurking at the very edge of our solar system.