No one knows. Certainly before life existed on earth
1610
The rings of Saturn orbits Saturn
There are three theories on how Saturn got its rings: 1. Gravitational disruption of satellites: Saturn's gravitational pull tears anything apart that gets too close, and the fragments become part of the ring system. 2. Fragmentation of moons: moons of Saturn collide with each other and other bolides and break up, the fragments of which form Saturn's rings. 3. Accretionary remnant: rings are formed from primordial debris that was not accreted to form Saturn initially.
The tidal forces from Saturn's gravity are to strong for the rings to form a moon.
THe Saturn Rings are a "Belt" of asteroids that have all found a similar orbit around Saturn. They are made after a collection of asteroids fall into the same orbit, and when observed from a distance, look like the classic "rings".
Giovanni Domenico Cassini discovered the division between Saturn's rings in the year 1675. This prominent division, known as the Cassini Division, is a gap between the A and B rings of Saturn and is named in his honor.
Galileo discovered the rings of Saturn in 1610.
There are three theories on how Saturn got its rings: 1. Gravitational disruption of satellites: Saturn's gravitational pull tears anything apart that gets too close, and the fragments become part of the ring system. 2. Fragmentation of moons: moons of Saturn collide with each other and other bolides and break up, the fragments of which form Saturn's rings. 3. Accretionary remnant: rings are formed from primordial debris that was not accreted to form Saturn initially.
Saturn's rings
Galileo discovered Saturn in 1610 through his telescope. He observed its unique shape and rings but was unable to identify them accurately at the time.
Jupiter, Saturn, Uranus and Neptune have rings and we do not know precisely how they form (there is more than one possible mechanism)
Saturn because of all its rings and Gassy form.