What is a Habitable Zone?

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Presentation transcript:

What is a Habitable Zone?

What is a Habitable Zone? Planets must be in the “just right” zone around a star, where it is not too cold (too far away) or not too hot (too close). too cold Habitable zone too hot Star

What is a Habitable Zone? Stars that are too large or too hot do not live long enough for planets to evolve around them.

What is a Habitable Zone? Stars that are too small or too cool require planets to be so close that they become tidally locked, meaning they do not rotate. If a star doesn’t rotate, one side is in constant night (freezes – too cold) and the other side is in constant day (boils – too hot).

What is a Habitable Zone? A medium-sized yellow star like the Sun is the most likely type of star to have a habitable zone.