How rare is life in the Universe? Is the idea of life elsewhere a realistic one? Let’s discuss.
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Dave: It’s been said that life probably occurs on billions of planets!
Jeff: I honestly hope that’s true – I’d love to visit another world.
Dave: But we have to be realistic about the probability of life occuring.
Jeff: And for life to occur on Earth – or any planet – a staggering number of factors have
to come into play.
Dave: For instance…
Jeff: A planet with complex life has be a terrestrial planet, where plate-tectonic recycling
Dave: You mean all the continent’s changes and the land being recycled (like in
Volcanoes) actually helps life exist?
Jeff: Absolutely. In addition we have to have just the right mix in our atmosphere for us
to breathe and live!
Dave: Right – Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune…
Jeff: None of them have atmospheres we can use. Only Earth does. And there are a
TON of other factors such as a particular moon, the existence of certain chemicals…
Dave: Suffice it to say, life doesn’t just occur by accident.
For more information check out the book, “The Privileged Planet.”