Voyager 2 is a space probe launched by NASA on August 20, 1977, to study the outer planets. As of today its over 17 light hours away. That means light which travels at 3,00,000 km/second takes 17 hours to reach it.
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On Jan 25, 2020, Voyager 2 attempted to calibrate it’s magnetic field instrument and failed badly. The probe drew additional power.
So, the engineer’s fitted the probe with radioisotope thermoelectric generators which converts heat ..
Just a reminder that we need not look further than space travel for the marvellous engineering