What defines the classic Habitable Zone (HZ) utilized in exoplanet searches?
Answer
The range of distances where surface liquid water can exist
The Habitable Zone, frequently called the Goldilocks Zone, is a foundational concept in astrobiology defined by the orbital distance from a star where the thermal conditions are neither too extreme nor too mild. Specifically, this zone represents the distance band where the received stellar energy allows surface temperatures to permit water to exist primarily in its liquid phase. If a planet orbits inside this range, water tends to boil off; if outside, it freezes solid, illustrating the narrow temperature window required.
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