What describes the terminator line on a tidally locked planet?

Answer

The twilight strip between the day and night sides

On a tidally locked world, the terminator line represents the twilight transition zone located between the side of the planet experiencing perpetual daylight and the side experiencing permanent darkness. This area is significant because it might theoretically offer the only temperate environment capable of supporting surface conditions conducive to life, as the other sides are either too hot or too cold.

What describes the terminator line on a tidally locked planet?

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