Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

Decades ago, a renegade physicist suggested that gravity isn't so much a force as just a byproduct of the universe's tendency ...

What we know about the search for ‘Planet Nine’ in our solar system - The idea of a massive undiscovered planet has been ...

A new paper led by a York University professor and published today in Nature Astronomy introduces a simple theoretical ...

An infinity symbol–shaped galaxy hosts an active supermassive black hole. The growing giant may have come from the aftermath of a galactic smashup.