A 'captured' alien planet may be hiding at the edge of our solar system — and it's not 'Planet X'

The cold and mysterious Oort cloud at the edge of our solar system may be hiding a rogue exoplanet, new research suggests.

A 'captured' alien planet may be hiding at the edge of our solar system — and it's not 'Planet X'
The cold and mysterious Oort cloud at the edge of our solar system may be hiding a rogue exoplanet, new research suggests.