Engineers at NASA and Lockheed Martin Space have performed the difficult task of measuring the fuel supply of the oldest Mars orbiting spacecraft without the use of a fuel gauge, after calculations indicated the probe may be close to running on empty.
Estimates from 2021 and 2022 indicated the Mars Odyssey orbiter has exhausted its propellant much faster than expected, prompting the investigation of the craft's "missing fuel." Eventually, the scientists concluded that the missing fuel was never missing at all! That means Odyssey should have enough propellant to keep going until the end of 2025.
