Given that as all probes have solar panels attached to them why do they have to shut down at the last stage? I googled and found that dust sticks to panels, because of which, they cannot function properly.
But suppose a glass/any material covering was put around solar panels, would this be a more power-consuming task to clear the glass again so that again sunlight would pass to the panels? I know it kind of sounds stupid but I am not able to swallow that solar panels cannot function eternally for probes?
According to me at least they should function for 100 years :P