For astronomers, Proxima b is a dream planet. Discovered last month orbiting the star nearest to our own solar system, it is thought to reside squarely in what scientists call the “Goldilocks zone”—where the temperature for life is just right.

The news prompted excited questions among scientists: Is there really water on Proxima b? Could a rocket make it there one day? Could there be life on the planet? But it started a very different discussion among Christians: Would alien souls need saving? And if so, do missionaries have a responsibility to rocket into space with a trunk full of Bibles?

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