5,000 possible alien worlds in less than 4 years for NASA planet-hunting mission

It’s been a busy four years for NASA’s Transiting Exoplanet Survey Satellite (TESS) and the scientists who seek planets in its data.

The mission just hit a major discovery milestone, passing 5,000 of what the team calls TESS Objects of Interest, or TOIs, which include exoplanet candidates and other intriguing signals. Astronomers select objects from these TOIs to study in more detail and with other instruments in order to better understand what TESS may have seen.