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Previous research shows that "concert tremor" can be recorded as long-duration signals with narrowband, harmonic frequency peaks between 1 and 10 hertz.

He explains that traditionally, Seti has looked for narrowband signals similar to those used by human beings.

U.S. defence company Northrop Grumman has pulled out of a competition to supply narrowband military satellite communications for Britain's armed forces, the Financial Times reported on Friday.

A UK Ministry of Defence spokesperson said: "SKYNET 6 will deliver the UK's next generation of military satellite communications and the narrowband and wideband procurement processes are ongoing."

The FT said Northrop's withdrawal from the narrowband part of the tender left a partnership between Thales Alenia Space and Thales UK as the only contender in the race.