Where in the galaxy, other than Earth, could human life survive? Proxima B may be the answer to this cosmic question. The planet orbits the red dwarf star Proxima Centauri, the closest star to our Sun. First discovered in 2016, NASA says, The exoplanet is at a distance from its star that allows temperatures mild enough for liquid water to pool on its surface." Journey over four light years to the twin star system of Alpha Centauri in Proxima B, by...