Goldilocks Zones

A Goldilocks Zone is the volume around a star in which a planet habitable by humans could exist. This volume is different for different types of star. Astronomy Picture of the Day for 31/1/20 had the graphic below showing such zones for three types of star but also their likely X-ray irradiation, relative abundance in the Milky Way and longevity.

Our sun is in the bottom category in the graphic, least long-lived, least abundant, but also with least irradiation.

Goldilocks Zones

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