It could be that for an Earth-like planet to form, the metallicity of its solar and galactic neighborhood needs to be close to that of our early solar system.
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Along with those we've already discussed in this series, further parameters must be added to the list of conditions for a life-supporting planet.
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Astrobiologists have used the term for many decades. This shell encompasses the distance at which a planet in a fairly circular orbit could maintain liquid water on its surface.
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Since there are so many planets in the galaxy and universe, it's natural to assume that there must be other intelligent life forms out there.
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