Inhabitants of Earth believe in aliens because of optimism, not scientific evidence.A Princeton University study by Edwin Turner and David Spiegal analysed what is actually known about life on other planets and found that there’s little to support that there is real life on other planets.
“Fossil evidence suggests that life began very early in Earth’s history and that has led people to determine that life might be quite common in the universe because it happened so quickly here, but the knowledge about life on Earth simply doesn’t reveal much about the actual probability of life on other planets,” Turner said.
Satellites and telescopes deep in space have recently identified various planets that are similar to Earth in size and make-up, and are” within their star’s habitable zone, the optimal distance for having liquid water,” according to Princeton’s newsletter:
While these observations tend to stoke the expectation of finding Earth-like life, they do not actually provide evidence that it does or does not exist, Spiegel explained. Instead, these planets have our knowledge of life on Earth projected onto them.
Joshua Winn, a physics professor at MIT, said the study turns all previous theories about life on other planets on its head:
“There is a commonly heard argument that life must be common or else it would not have arisen so quickly after the surface of the Earth cooled,” Winn said. “This argument seems persuasive on its face, but Spiegel and Turner have shown it doesn’t stand up to a rigorous statistical examination — with a sample of only one life-bearing planet, one cannot even get a ballpark estimate of the abundance of life in the universe.”
So that being said, we might only get exposure to aliens in movies.
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