There's trash in the deepest ocean depths, at some 35,700 feet beneath the surface. There's also trash on Mars. While looking for hints of past microbial Martian life, NASA's Perseverance rover recently spotted landing debris caught in a jagged rock. It's thermal material the space agency used to protect the Perseverance spacecraft from extreme temperatures as it journeyed to Mars and plummeted through the Martian atmosphere. "My team has spotted something unexpected: It’s a piece of a thermal blanket that they think may have come from my descent stage, the rocket-powered jet pack that set me down on landing day...