Why Isn't the Milky Way Crowded With Mechanical or Biological-Life?-Stephen Hawking's Reply - Physics-Astronomy.org

Why Isn't the Milky Way Crowded With Mechanical or Biological-Life?-Stephen Hawking's Reply

In his well-known speech on Life in the Universe, StephenHawking questions: "What are the chances that we will meet some alien form of life, as we explore the galaxy?" If the argument of the time scale for the presence of life on Earth is correct, Hawking states "there ought to be many other stars, whose planets have life on them. Some of these stellar system could have formed 5 billion years previous to the Earth. So why is the galaxy not crawling with self-designing automatic or biological life forms?" Why hasn't the Earth been visit by an alien life, and even colonized? Hawking questions. "I reduction suggestions that UFO's hold beings from outer space. I think any visits by aliens, would be much additional obvious, and almost certainly also, much more unpleasant.What is the explanation of why we have not been visit? One possibility is that the argument, about the look of life on Earth, is wrong. Maybe the likelihood of life spontaneously appearing is so low, that Earth is the only earth in the galaxy, or in the observable universe, in which it happen. Another possibility is that there was a reasonable probability of forming self-reproducing system, like cells, but that most of these forms of life did not develop intelligence."
Why Isn't the Milky Way Crowded With Mechanical or Biological-Life?-Stephen Hawking's Reply
We are old to discerning of intelligent life, as an unavoidable significance of development, Hawking highlighted, but it is extra probable that evolution is a casual process, with intelligence as only one of a enormous number of conceivable results.
 In difference the microbial world will live on, even if all extra life on Earth is wiped out by our activities. Hawking's key idea is that intelligence was a doubtful growth for life on Earth, from the timeline of evolution: "It took a very long time, two and a half billion years, to go from single cells to multi-cell beings, which are a essential precursor to intelligence. This is a good quality fraction of the totality time available, previous to the Sun blows up. So it would be consistent with the hypothesis, that the probability for life to develop intelligence is low. In this case, we might wait for to find many other life forms in the galaxy, but we are unlikely to discover intelligent life."
Intelligence, Hawking consider differing to our human-centric existence, may not have some long-term existence value. One additional prospect is that there is a rational possibility for life to exist, and to evolve to intelligent creatures, but at sure point in their technological growth "the system becomes disturbed, and the intelligent life terminates itself. This would be a very doubtful inference. Hawking fancies one extra option: that there are additional forms of intelligent life out there in the universe, but that we have been unnoticed.
 If we have to pick up indicators from alien race, Hawking advises, “we ought to have been wary of answering back, until we have evolve" a bit further. Encountering a additional progressive civilization, at our present stage,' hawking states "might be a bit like the unique inhabitants of America meeting Columbus. I don't think they were improved off for it."

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