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In order for there to be LIFE AS WE KNOW IT on a planet, the planet must have liquid water; between 0 degrees Celsius and 100 degrees Celsius. Very few life forms are capable of living in boiling water (although a new variety of bacteria has been discovered living in salty ice pockets in Antarctica).

If a planet is too close to a star, the temperature will be too hot; too far from the star, and the planet will be too cold. Only within the "habitable range" would humans be able to colonize the planet.

Because we humans have not yet found other kinds of life, we have difficulty imagining what conditions "life as we DON'T know it" might be able to live in. I suspect that we will find that "life" exists in a vast range of environments that we humans would not find habitable.

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