A new exoplanet only 4.2 light years away would prove that there's plenty left to discover in our own cosmic backyard. Scientists have found evidence of a new exoplanet candidate orbiting our closest stellar neighbor, Proxima Centauri. This exoplanet candidate, Proxima c, likely has a mass six times that of Earth. But it's unlikely that life would survive on the planet, given its frigid temperatures. ----------------------------------------------------------------------- The red dwarf star Proxima Centauri is our closest stellar neighbor; the star system is a measly 4.2 light years from Earth and can be seen with the naked eye. Because of this proximity,...