We all know we live in three-dimensional space. But what does it mean when people talk about four dimensions? Is it just a bigger kind of space? Is it "space-time," the popular idea which emerged from ...

A fringe new theory suggests that time is the fundamental structure of the physical universe, and space is merely a byproduct. According to Gunther Kletetschka, a geologist — not a physicist, you’ll ...

Does the size of space — those zillions of stars and zillions of miles of nothing between them — freak you out? Well, if it does, guess what? You're not alone. I give a lot of public talks about the ...