Recent surveys hint that the rate of cosmic expansion changes dramatically over time; if that's true, then the universe could ...

What if there are other universes, just like ours? With an infinite number of Earths? With uncountable versions of you? And what if we don’t have to look too far to find them? Maybe a mirror version ...

Believe it or not, Marvel's long-running What If? series turns 50 this year. That's a lot of alternate universe superhero stories. But there's still plenty more ground left to cover, as Marvel reveals ...

A novel theory suggests that the current expansion rate of the universe is not fixed, but was in fact quite different in the early universe—and that the universe could start contracting at some point.

Relax, it’s only happening in theoretical physics—at least for now.

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, good ol' Earth helps us understand what the universe might be doing beyond ...

To celebrate the 50th anniversary of What If...?, Marvel Comics is taking a bold leap into the Multiverse to discover mythos-shattering new twists on some of its most definitive stories. In What If ...