The largest-ever three-dimensional map of the cosmos, plotting out some 15 million celestial objects, could help reveal the ultimate fate of the universe. Astrophysicists know that the universe is ...

For most of us, or perhaps all of us, it's impossible to imagine a world consisting of more than three spatial dimensions. Are we correct when we intuit that such a world couldn't exist?

Monsters from other dimensions are a staple of B-movies. The Millennium Falcon flies through hyperspace to get from planet to planet in Star Wars. The theory of relativity describes our universe ...