About this world
MOA-2012-BLG-505L b is a sub-Neptune orbiting MOA-2012-BLG-505L, a star 23.5 thousand light-years from Earth. It is about 2.5 times the size of Earth (its size estimated from its mass) and holds 6.7 Earth masses.
At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2017 by microlensing with MOA. A foreground star's gravity magnifies a background star; a planet adds a blip.