Our best model of the cosmos has a glaring mathematical problem, but we may have found an answer.

There may not be as nearly as many small galaxies in the early universe as astronomers predict there should be, which has big implications for the story of how our universe grew up. When you purchase ...

Most messages are press releases about astronomical discoveries—okay, scratch that; most of them are spam, but science announcements are an easy second place. But I also get questions from readers ...

It’s always amazing, and more than a little humbling, when the universe reminds us that our “common sense” is provincial and will fall apart on cosmic scales. If you’re on the surface of Earth—and I’m ...

Whether the universe will “end” at all is not certain, but all evidence suggests it will continue being humanity’s cosmic home for a very, very long time. Our understanding of the future of the ...