Scientists have confirmed the existence of two mysterious celestial objects: 'Gaia-4b' exoplanet and 'Gaia-5b' brown dwarf. "These massive objects are unexpectedly orbiting low-mass stars," the European Space Agency (ESA) said. "Gaia-4b is about twelve times more massive than Jupiter. With an orbital period of 570 days, it is a relatively cold gas giant planet," ESA added.