Stephen Hawking's stark warning about contacting advanced alien civilisations has been brought back into focus following a Harvard University paper speculating that a comet could be an extraterrestrial reconnaissance probe.
Researchers Avi Loeb, Adam Hibberd and Adam Crowl suggested that comet 3l/ATLAS might be a technological artefact sent by an intelligent civilisation to observe Earth. Their paper outlined two possibilities: that its intentions are entirely benign, or that they are malign, in which case defensive measures would be required.
The team, along with NASA scientists, have since emphasised that the most likely explanation is that 3l/ATLAS is simply a comet. However, the hypothesis has revived Hawking's earlier warnings about the potential dangers of making contact with alien life.
Before his death in 2018, Hawking repeatedly cautioned that a more advanced alien civilisation might not be peaceful. In a 2010 episode of Into the Universe, he said: "If aliens ever visit us, the outcome might be similar to when Columbus landed in America, which didn't turn out well for the Native Americans."
Hawking argued that a civilisation capable of interstellar travel would likely have exhausted their own planet's resources and might seek to colonise other worlds. His concerns align with the 'dark forest hypothesis', which suggests that alien civilisations remain silent to avoid attracting attention from hostile forces.
