A pit in Mare Ingenii, possibly the result of a collapsed lava tube. Natural tunnels like this would be ideal sites for an alien moon base. Photograph: Nasa
We Should Scour The Moon For Ancient Traces Of Aliens, Say Scientists -- The Guardian
Online volunteers could be set task of spotting alien technology, evidence of mining and rubbish heaps in moon images.
Hundreds of thousands of pictures of the moon will be examined for telltale signs that aliens once visited our cosmic neighbourhood if plans put forward by scientists go ahead.
Passing extraterrestrials might have left messages, scientific instruments, heaps of rubbish or evidence of mining on the dusty lunar surface that could be spotted by human telescopes and orbiting spacecraft.
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My Comment: The moon is one hell of a big place.