…Emerge, and we now know these pulsating signals to be produced by rapidly rotating neutron stars, known as pulsars, that emit beams of radiation akin to the beams of light emitted by a lighthouse. Ever since, an international effort known as the search for extraterrestrial intelligence has actively been listening for artificial transmissions.
The radio source was even named LGM-1, an acronym for little green men.
However, it soon became clear the signal did in fact emanate from deep space and the unwavering precision of the pulses was unlike anything seen before. As such, many questioned whether it was a naturally occurring phenomenon or a transmission from another civilization.
In 1977, a momentary burst of energy swept across the planet.
Is currently supporting life.
Atmosphere with a similar concentration of oxygen could be taken as a sign of life. This is known as a biosignature.
