An article published in “The Astronomical Journal” reports a study that reviews the data of four objects discovered a few years ago thanks to NASA’s Kepler space telescope, concluding that at least three of them are actually tiny stars and not planets. A team of researchers used new data collected by ESA’s Gaia space probe to get more precise information on objects cataloged as exoplanets. Kepler-854b, Kepler-840b, and Kepler-699b appear to have sizes between two and four times Jupiter’s, too much even for hot Jupiters very close to their stars but possible for tiny stars. Kepler-747b turns out to have a radius 1.8 times Jupiter’s even though it’s quite far from a star a little smaller than the Sun, so its nature is uncertain.