Are multiverses real? If so, what do they look like? How do you get there without disturbing time? – Emily, age 9, Pune, ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." For over a century, scientists ...

In the strange world of quantum mechanics, objects can exist in several states at once. This concept, called superposition, is one of the most puzzling features of quantum theory. A particle, for ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Science’s best guess at how the universe came into being includes the Big Bang ...

Joseph Polchinski, one of the most creative physicists of his generation, whose work helped lay the mathematical foundation for the controversial proposition that our universe is only one in an almost ...

The Big Bang may be a Big Bogus. A team of physicists at the University of Portsmouth theorize that the universe was created by a massive, reality-shattering bounce — with material from an ancient ...

Given how unfathomably large the universe is, it is perhaps understandable that we haven’t yet cracked all its secrets. But there are actually some pretty basic features, ones we used to think we ...

SCATTERED THROUGHOUT THE UNIVERSE are ravenous black holes that pull gas, dust, light and even other black holes into their maw, never to be seen again. Like a riptide pulling swimmers out to sea, the ...

In 1998, astronomers discovered dark energy. The finding, which transformed our conception of the cosmos, came with a little-known consequence: It threw a wrench into the already daunting task of ...