A new exoplanet discovery is the first of its kind, sitting in a strange 'gap' of exoplanets insanely close to their host stars. The planet is a Neptune-sized body that whips around its star once every 19 hours. Never before has a Neptune-sized exoplanet been found with an orbital period of less than a day. Usually, exoplanets this close to their star are either gas giants, known as ultra-hot Jupiters, or smaller, rocky planets like Earth, Mercury, Mars and Venus, known as ultra-short period planets. This new class, represented by this sole member, has been dubbed "ultra-hot Neptunes". Curiously, its...