Every year, ultrarunners sign up to compete in a brutal race that stretches 135 miles across Death Valley in the high heat of summer. Because of its harsh conditions, the Badwater 135 is perhaps the ...

The solar system floats inside a vast, million-degree hot bubble—an invisible cocoon of thin gas that glows in X-ray light. Known as the Local Hot Bubble (LHB), this low-density cavity stretches more ...