How did the universe form?
Zakharchuk/Shutterstock A few things we know about the universe: it’s infinite, it’s littered with black holes, and thinking about it can make your brain hurt. And one of those things we don’t know: how it began. Even otherwise all-knowing Stephen William Hawking, PhD, theoretical physicist, cosmologist, and director of research at the Centre for Theoretical Cosmology in Cambridge, England, isn’t sure. Some brilliant minds wonder if it even had a beginning at all, or if it was always there.
You’ll also want to check out these unsolved mysteries, which are sure to cause shivers.
What happens inside a black hole
REDPIXEL.PL/Shutterstock Black holes are places in space where gravity is so strong that even light can’t escape, so no one has ever been able to say what happens inside a black hole. That said, Dr. Hawking has theorized that rather than being stored within the deep clutches of a black hole, information from “within” a black hole actually remains outside of it (in the “event horizon”) and is therefore theoretically accessible. (Still with us?) Of course, since the event horizon is outside the black hole, the theory itself is a paradox.