Answer:
Habitable Planets. A "habitable" planet should: Orbit a star that remains stable in output for billions of years. Be at a distance from the star that results in its achieving a suitable temperature so its surface water is liquid, not frozen.
Example
A star that remains stable in output for billions of years can orbit a habitable planet. The habitable zone, also known as the Goldilocks zone, is the range of distances from a star where liquid water could exist on the surface of an orbiting planet. In this zone, conditions might be just right for life, neither too hot nor too cold. If a planet is too close to its star, it will be too hot and water would have evaporated. If a planet is too far from a star it is too cold and water is frozen
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