A red dwarf system containing the first exoplanet discovered by the MEarth project, which seeks to detect transiting Earth-like planets around nearby red dwarves, and the second transiting super-Earth. The planet is the first of a new class of planets with low mass and low density. It is between Earth and Neptune in radius and it could be a small Neptunian, a terrestrial with an outgassed atmosphere, or a water world. Its featureless spectrum (the first Super Earth atmosphere ever studied) suggests a heavy atmosphere choked with water steam or one with thick water clouds above it, making viewing the surface impossible (further studies should resolve this). It may be the coolest transiting planet detected. Its close proximity (under 50 ly) assures promising future observation.