A NASA instrument the size of a toaster, riding inside the Perseverance rover, converted Martian air into 122 grams of breathable oxygen between 2021 and 2023 — enough to keep a small dog alive for 10 hours, and proof that astronauts could one day make the fuel to fly themselves home
The strangest thing about MOXIE is that 122 grams can sound both tiny and enormous. On Earth, it…