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Is our planet the only habitat of living systems? Or, are there other locations far beyond the Earth that also support life? These questions have stirred human imagination in all epochs past and present. Old folk tales from various cultures talk about extraterrestrials (ETs in brief), with considerable glamour attached to them. With the advent of science fiction, the ETs provided a staple diet to the emerging genre. But what does hard science think of the above questions?

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