Video: Black hole time travel W/ Stephen Hawking

"It's a super massive black hole, containing the mass of 4 million suns, crushed down into a single point by its own gravity. The closer you get to the black hole, the stronger the gravity. Get really close and not even light can escape. So, it's wrapped in a sphere of darkness 15 million miles … Continue reading Video: Black hole time travel W/ Stephen Hawking