Using the microlensing technique, astronomers determined the planet's mass. This method, however, does not reveal any clues about an object's composition. Astronomers think the planet is composed of ice and rock. Its estimated mass suggests that it is a giant version of terrestrial planets like Earth and Mars. The planet orbits the most common star in our Milky Way Galaxy, a red dwarf five times less massive than the Sun. The pair is located about 20,000 light-years away in the constellation Scorpius, not far from the central bulge of our galaxy.