By Marina Koren
September 12, 2022
Millions of miles away on Mars, in a barren crater just north of the equator, a rover is wandering around, carrying a gold-coated gadget the size of a toaster. The machine inhales the Martian air and strips away contaminants. It splits the atmospheric gas into constituent parts, takes what it needs, and then reassembles that blend to create something that is in very short supply on Mars: oxygen. Real, breathable oxygen, the kind you took in as you read these sentences.