planet 128Only 11 lht-years away, Ross 128 b is the 2nd-closest-known rocky exoplanet. Here's a recent study scrutinizing Ross 128 b, as it relates to the fascinating search for distantRoss 128 b is a super Earth exoplanet that orbits a M-type star. Its mass is 1.4 Earths, it takes 9.9 days to complete one orbit of its star, and is 0.0496 AU from its star. Its discovery was announced in 2017.