Astronomers have long speculated about an unseen planet lurking in the solar system's outer edge. This hypothetical world, ...

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

As Prime Minister Mark Carney prepares to start negotiating with U.S. President Donald Trump, CBC’s Alex Panetta breaks down three things Carney needs to sort out beforehand.