The Goldilocks Zone
The narrow band where conditions are 'just right' — not too much, not too little.
Origin
From the 1837 English tale Goldilocks and the Three Bears, in which a girl breaks into the bears' house and tries each chair, bowl of porridge, and bed — rejecting the too-big and the too-small in favor of the one that's 'just right.' Astronomers borrowed it in the 20th century to name the orbital range around a star where liquid water — and therefore life as we know it — can exist. The phrase then leaked into economics, design, and product strategy.
Modern usage
Now arguably more common in science writing and business writing than in storytelling. 'A Goldilocks economy' has neither too much inflation nor too much unemployment; 'a Goldilocks product' is priced and featured 'just right.' The original story has become almost incidental.
In the wild
Earth sits in the Sun's Goldilocks zone — close enough for warmth, far enough not to boil.— popular science
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