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TagPrinciple of Mediocrity

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The Earth from space. This image elements furnished by NASA.

Astronomer: We Can’t Just Assume Countless Earths Out There

He points out that the Principle of Mediocrity is based on faulty logical reasoning

Dartmouth physicist and astronomer Marcelo Gleiser wrote recently that the Copernican Principle has been misused to imply that Earth is somehow insignificant. That, he says, is a philosophical attitude, unrelated to the science. We don’t know where Earth stands in relation to other planets because we do not yet have telescopes capable of getting much detail about planets outside our solar system. Gleiser, author of The Island of Knowledge (2014), has also tackled the Mediocrity Principle (because Earth is nothing special, there must be countless intelligent civilizations out there). According to Britannica, “Widely believed by astronomers since the work of Nicolaus Copernicus, this principle states that the properties and evolution of the solar system are not unusual in any important…

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The region 30 Doradus lies in the Large Magellanic Cloud galaxy.

Maybe There Are Just Very Few Aliens Out There…

The Rare Earth hypothesis offers science-based reasons that life in the universe is rare

Recently, science and science fiction writer Matt Williams has been writing a series at Universe Today on why extraterrestrial intelligences never make contact with us. Last week, we looked at the hypothesis that, to avoid the heat destruction of their advanced technology, the aliens have put themselves into a digital slumber until the universe cools down. This week, let’s look at a quite different approach, which Williams outlines in “Beyond “Fermi’s Paradox” IV: What is the Rare Earth Hypothesis?” (July 29, 2020): That is “the possibility that life-bearing planets like Earth are just very rare.” We don’t see aliens because they are very uncommon: This is what is popularly known as the “Rare Earth Hypothesis,” which argues that the emergence…