Some of the most famous space missions have been running for decades. The technology helping to keep them aloft is anything but space age.
Power has also been an issue. The Cluster satellites are fitted with solar arrays for electricity but, twice a year, they pass into the Earth's shadow and need batteries to survive.
Rather than wait until the reaction wheels gave up completely, mission controllers had the idea of activating the fourth wheel but running all the wheels at a slower speed. At 10.30am on 22 September 2021, the alarms went off in Esa's Integral mission control room at Esoc. A reaction wheel had stopped working on, tripping the satellite into safe mode but, worse, sending it slowly spinning out of control.
The humble technology on Voyager 2 was still good enough for it to send back detailed images of our neighbouring planets Since then, Integral has been operating well. But what if something goes wrong when your elderly spacecraft is around a distant world 150 million km away?was designed to orbit Mars for two years. After nearly 20, the mission has investigated the atmosphere and delivered stunning imagery of the Martian surface, as well as acting as a relay for a series of Nasa rovers.
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