... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Cosmic Adventures . ... Cassini reveals Saturn is on a cosmic dimmer switch . The ringed world gradually gave off less energy each year between 2005 and 2009. ... Like a cosmic light bulb on a dimmer switch, Saturn emitted gradually less energy each year from 2005 to 2009, according to observations by NASAт??s Cassini spacecraft. But unlike an ordinary bulb, Saturnт??s southern hemisphere consistently emitted more energy than its northern one. ...