Technicians work on the MAVEN spacecraft at NASA’s Kennedy Space Center in Florida ahead of its launch in 2013. Credit: NASA/Kim Shiflett
But NASA’s two other Mars orbiters have been in space for more than 20 years. The older of the two, named Mars Odyssey, has been at Mars since 2001 and will soon run out of fuel, probably some time in the next couple of years. NASA’s Mars Reconnaissance Orbiter, which launched in 2005, is healthy for its age, with enough fuel to last into the 2030s. MRO is also important to NASA because it has the best camera at Mars, with
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