Planets bigger than earth may exist ‘at edge of space’

PLANETS as large, or bigger, than the Earth are waiting to be discovered at the edge of the solar system, scientists believe.

Some of them may contain warm oceans in their interiors, opening up the possibility of hidden havens for life trillions of miles from the sun.

The objects are thought to exist in the Oort Cloud, a vast region swarming with comets that marks the outer boundary of the solar system.