The planet, named KOI-314c, is the lightest planet to have both its mass and physical size measured, and it is the first Earth-mass planet to have been located as it passes its host star... The newfound planet is in close orbit with its host star, a red dwarf, which it orbits every 23 days. At 220 degrees Fahrenheit, the temperature on the planet, which is about 200 light years away, is too hot for life as we know it to exist. The planet is only about 30 percent denser than water, the astronomers report, which suggests that the gaseous planet...