In 2006 observations revealed a previously unknown class of variable stars, the "slowly pulsating B supergiants" ("SPBsg"). In 2011, MOST detected transits by exoplanet 55 Cancri e of its primary star, based on two weeks of nearly continuous photometric monitoring, confirming an earlier detection of this planet, and allowing investigations into the planet's composition. In 2019, MOST photometry was used to disprove claims of permanent starspots on the surface of that were alleged to be caused by interactions between the magnetic fields of the star and its "hot Jupiter" exoplanet.