The most precise measurement of the expansion rate ever made suggests an unknown force may be affecting the universe.

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be straightforward. Objects are still emitting light, and that light takes time to travel ...

Cosmologists have long treated black holes and the Big Bang as separate extremes of physics, one swallowing light, the other birthing space and time. A provocative line of research now suggests those ...

If there is an absolute law in the universe, it’s that nothing can travel faster than the speed of light. For science-fiction enthusiasts, that’s a bit depressing. Space is big, and while the speed of ...

"It's not every day that you come up with an entirely new tool for cosmology." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A team of ...

The local universe may be expanding more slowly than previously thought. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The local universe may ...

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 ...

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.