Why You’ll Never See a Red Comet Like in ‘Game of Thrones’

A blood-red comet appears in the sky. People quake in its wake. This phenomenon, which happens in the second season of the medieval fantasy Game of Thrones, had us all wondering – can you ever actually see a red comet? We talked to Matthew Knight, an astronomer at the Lowell Observatory in Arizona who observes comets. He [...]