A black hole is a region in space where the pull of gravity is so strong that nothing, not even light, can escape. Black holes billions of times bigger sive than our sun may be at the heart of most galaxies, and astronomers have now discovered one in the center of a galaxy 50 million light years away that contains the mass of 6 billion suns–and measured its radius.

Astronomer Shep Doeleman says, "(In super massive black holes), "gravity completely goes haywire and crushes an enormous mass into an incredibly close space." A black hole has a boundary called an event horizon, and anything that falls within a black hole’s event horizon can never escape. According to Doeleman, "Once objects fall through the event horizon, they’re lost forever. It’s an exit door from our universe. You walk through that door, you’re not coming back."

Sounds eerie, all right–but not nearly as strange as some of the things that are going on right here on EARTH, like UFO "visitations." Here’s how WE investigate them: We TALK DIRECTLY to the people who have had Visitor experiences and LET THEM tell us what’s going on. If you subscribe today, you can listen to all 22 of these fascinating interviews.