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“If the argument about the time scale for the appearance of life on Earth is correct”, Stephen Hawking observed, echoing Enrico Fermi’s infamous question–Where is Everybody– “there ought to be many other stars, whose planets have life on them. Some of these stellar systems could have formed 5 billion years before the Earth. So why is the galaxy not crawling with self-designing mechanical or biological life forms?”

In his famous lecture on “Life in the Universe”, Stephen Hawking, who was laid to rest in 2018 in Scientists’ Corner at Westminster Abbey, between Isaac Newton and Charles Darwin, asked: “What are the chances that we will encounter some alien form of life, as we explore the galaxy?”

Why hasn’t the Earth been visited, and even colonized? Hawking asks, “I discount suggestions that UFO’s contain beings from outer space. I think any visits by aliens, would be much more obvious, and probably also, much more unpleasant.”

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