Black holes are impossible to observe directly. But researchers like Jason Dexter are probing the hot and violent regions of space that circle these mysterious objects.
Mars is a dangerous place for vulnerable humans—but robotic space missions can probe the planet's radiation, dust storms and other threats safely and for a fraction of the cost of crewed missions.
Jack Chin, the father of Professor Karen Chin, was just 17 when he enrolled in the U.S. Army Air Forces as a member of the final class of Tuskegee Airmen.
Since the 1980s, Colorado's small mammals have made an ominous trek—climbing, on average, 400 feet uphill in elevation to escape from climate change.