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The Cosmos: Origins and Aliens

The Cosmos: Origins and Aliens

Paperback

Astronomy & Space

ISBN13: 9798849492223
Publisher: Independently Published
Published: Sep 1 2022
Pages: 272
Weight: 0.81
Height: 0.57 Width: 6.00 Depth: 9.00
Language: English

There are 400 billion stars in the Milky Way alone. The observable universe may have 100 billion galaxies in it. It is unimaginable how many planets which are habitable may be in such a system.
In 1964, Nikolai Kardashev suggested that civilizations might exist at three levels: Type 1 where beings use fossil fuels, like we do on Earth, Type 2 where beings tap energy from their star, and Type 3 where beings tap energy from their galaxy. Since that time, other scientists have speculated that civilizations might go all the way up to a Type 7 civilization where beings have become pure energy.

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Hartig, John

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Astronomy & Space