A strange, starless cloud on the edge of a nearby galaxy is forcing astronomers to confront one of the biggest unknowns in ...

A newly discovered celestial object may be a starless cloud that could change how astronomers understand dark matter.

Astronomers have called for help to identify a mystery object that may have hit Saturn on Saturday in what could be the first recorded instance of a space object crashing on to the gas giant. Studies ...

It's estimated there may be trillions of rogue planets wandering through the Milky Way, unbound to any star. Since detecting our first ones, we have been presented with an odd mystery.

ATLANTA (AP) — More than 200 people across a half-dozen southern U.S. states have now reported witnessing a mysterious object streak across the sky on Thursday, but no one is certain exactly what it ...