Catching Up With Perseverance on Mars

NASA’s robotic explorers are looking for signs of ancient life on Mars. In its five years and counting on the surface of the Red Planet, the Perseverance rover has collected dozens of rock samples, including tantalizing features that could be signs of past life. Scientists want to keep studying Mars. That’s why NASA plans to send a fleet of next-generation helicopter drones and—one day—astronauts.…