Try as they might, scientists can’t truly rid a space or an object of its energy. But what “zero-point energy” really means ...

Astrophysicists show how and when specific particles form and offers clues to questions that have troubled scientists since the 1940s. For decades, scientists have been trying to solve a vexing ...

New observations help astronomers hone in on a long-standing mystery about where cosmic rays come from. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Illustration of an array of ground-based detectors to characterize a cosmic ray shower. When high-energy cosmic particles strike the atmosphere, they produce a cascade of particles. By building a ...

Ultrahigh-energy cosmic rays twist and turn on their way to Earth, which has made it nearly impossible to identify the colossal monsters that create them. In the 1930s, the French physicist Pierre ...

One of the biggest mysteries of the universe is why its expansion seems to be speeding up. Physicists have attributed it to a strange force called dark energy, but exactly how it works is largely ...