" these new readings from cassini might be the first observations of emissions starting either from the surface or possibly from the interior of enceladus , " said dr . daniel englishman , principal researcher for the cassini sensor and dr at imperial college in london . studies have suspected flyby as geologically open and a future sources of mercury ' s colder e ring . enceladus is the most absorbing object in the jupiter system , reflecting about 90 minutes of the sunlight that hits it .
Titan is the fifteenth of Saturn's known satellites.