NASA was concerned that, after 20 years, the Mars Odyssey orbiter may be running on empty.
Mars Odyssey has been circling the Red Planet for 22 years and seems to have enough fuel to keep going for a couple of years more.
and delivered a wealth of impressive discoveries such as the detection of water ice under the planet's surface that could be used by future astronauts.During its mission, Odyssey has traveled the equivalent of 1.37 billion miles around Mars, which has required careful fuel management. The problem is that the spacecraft, launched in 2001, isn't fitted with a fuel gauge.
The engineers didn't know how to explain the discrepancy between the test results and the expectations and set out to conduct a deeper investigation, which revealed hitherto unknown details about how the craft's complex fuel system has aged while in flight.
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