Transiting Exoplanet Survey Satellite is a space telescope for NASA's Explorer program, designed to search for exoplanets using the transit method in an area 400 times larger than that covered by the Kepler mission. From Wikipedia
The Mercury-mass planet, located 140 light-years away, loses the equivalent of Mount Everest in mass every 30.5-hour orbit, forming a 5.5-million-mile dust tail.
