Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy.

Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, dubbed Planet Nine, could explain the unusual clustering ...

Kosmos 482 has been orbiting the Earth for decades. It's still unknown if the craft will fall to Earth intact or burn up upon ...

Some, called rogue planets, don't even orbit a star, but are rather floating through the cosmos untethered. Astronomers have confirmed the existence of more than 5,800 exoplanets, but billions are ...

The rogue probe is now in its "final death plunge ... But an apparent engine malfunction stranded the spacecraft in low Earth orbit, where it's been ever since. It was packed with a variety ...