Galactic habitable zone | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2019-03-20

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Galactic_habitable_zone


00:01:34 1 Background
00:04:29 2 Considerations
00:05:14 2.1 Chemical evolution
00:09:27 2.2 Catastrophic events
00:11:04 2.3 Galactic morphology
00:13:15 3 Boundaries
00:16:59 4 Criticism



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SUMMARY
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In astrobiology and planetary astrophysics, the galactic habitable zone is the region of a galaxy in which life might most likely develop. More specifically, the concept of a galactic habitable zone incorporates various factors, such as metallicity and the rate of major catastrophes such as supernovae, to calculate which regions of the galaxy are more likely to form terrestrial planets, initially develop simple life, and provide a suitable environment for this life to evolve and advance. According to research published in August 2015, very large galaxies may  favor the birth and development of habitable planets more than smaller galaxies such as the Milky Way. In the case of the Milky Way, its galactic habitable zone is commonly believed to be an annulus with an outer radius of about 10 kiloparsecs and an inner radius close to the Galactic Center (with both radii lacking hard boundaries).Galactic habitable-zone theory has been criticized due to an inability to quantify accurately the factors making a region of a galaxy favorable for the emergence of life. In addition, computer simulations suggest that stars may change their orbits around the galactic center significantly, therefore challenging at least part of the view that some galactic areas are necessarily more life-supporting than others.