Pulsars are rotating neutron stars – the ultra-dense cores of exploded supergiant stars – which emit jets of electromagnetic radiation from their poles. They act like interstellar lighthouses that repeatedly wash radio signals over Earth in a dependable rhythm. The first pulsar was discovered by Jocelyn Bell in 1967 and was nicknamed LGM-1 , because until a second one was discovered, extraterrestrial intelligence couldn’t be ruled out as the pulsar’s cause.
The theoretical foundation of this method is solid. So much so that the golden records which were attached to the side of the Voyager and Pioneer spacecraft in the 1970s graphically indicated the position of our sun relative to 14 pulsars, just in case any LGMs stumble across the spacecraft and want to visit us here on Earth. We’ve given them directions.
But if pulsars are such an effective form of navigation, why aren’t they already in use? After all, studies into the subject have been ongoing since the 1970s, when the Jet Propulsion Lab first began looking into the prospect.
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