The ability to detect man-made interference is not much use unless the source can be located, however.

ECONOMIST: GPS jamming

Down in the rock pools, then, the news seems to be mixed: nature is showing a remarkable resilience in the face of man-made interference, but it is still far from clear what the wider impact will be from small changes to local ecology.

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Both offer remote, sparsely populated areas with low levels of man-made radio interference, along with world-class teams of astronomers.

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By comparing the GPS and eLoran time signals with its internal clock, each probe can detect interference and determine whether it is natural or man-made.

ECONOMIST: GPS jamming