Think talk of UFOs and aliens is a load of nonsense? A Harvard boffin insists the truth really is out there . . . and that it's folly to assume we're the only life force in the universe. In this extract from his fascinating new book Professor Avi Loeb provides evidence that we’re not alone
A quarter of all known stars in the universe are thought to host a “perfect planet” – one the same size and temperature as Earth. There are approximately a “zetta” of them . . . that's a trillion billion – a one with 21 zeroes after it.
So it’s presumptuous for us to assume we are the only intelligent beings in this vast cosmos. In fact, to imagine we humans are alone in space isn’t merely arrogant, it is scientific nonsense.