What happens to the habitable zone of a star during the red giant phase?
Answer
It shifts outward away from the star
The habitable zone, defined as the region where liquid water can potentially exist on a planet, is determined by the heat and luminosity of the host star. As a star transitions into a red giant, its luminosity increases dramatically due to shell burning and expansion. This surge in energy output pushes the habitable zone further out into the solar system. Consequently, the region capable of supporting liquid water migrates away from the star's original position, potentially encompassing the orbits of more distant moons.
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