Aliens may have left their footprints or artefacts on the moon which would last far longer than radio signals.
Aliens may have left their footprints or artefacts on the moon which would last far longer than radio signals.u00a0Two astronomers from Arizona State University who suggest this possibility point out that we have been approaching alien life from a wrong end, scanning for radio signals from the distant stars, under the SETI (Search for Extraterrestrial Intelligence) project.
The detailed moon maps created by National Aeronautics and Space Administration's (NASA) Lunar Reconnaissance Orbiter (NLRO) may be the best place to look for alien life, they said, evidence such as trails or debris would remain there for millions of years, and be easier to 'catch' than radio signals.
"Evidence for extraterrestrial intelligence could come from any signatures of non-human technology," the journal Acta Astronautica quotes the scientists as saying.
They say that any alien mission to our solar system is liable to have occurred long ago, but the surface of the moon could preserve the signs for millions of years, according to the Daily Mail.
The photographs already captured by NLRO, currently mapping the moon's surface to 0.5 metre resolution, provides an easy, cheap way to look for these signs.
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