Stephen Hawking's black hole fame wasn't his only focus — he also laid out multiple existential threats. Here are five doomsday risks he talked about.

The dream of colonizing other planets is a science fiction fantasy. This video presents a harsh, scientific reality check on our solar system. We analyze the lethal conditions on Mars, Venus, and ...

Models help scientists understand everything from the particles that make up the universe to massive superstructures of galaxies at the beginning of time. But sometimes they model more mundane, though ...