Residents of the northern hemisphere, look up: In the faint shimmy of a star above you, astronomers have discovered evidence of an alien world. The proposed new planet is unlike anything in our own solar system, the researchers say - larger than Earth but smaller than Neptune, and far enough from its dim, red sun that any water on its surface is locked away in ice. But this frozen "super Earth," the second-closest exoplanet known to science, [...]