The astronomy show pays tribute to the space probe Cassini-Huygens, which ends its 20 year mission studying Saturn by crashing into the gas giant.
Presenters Maggie Aderin-Pocock and Chris Lintott look into the history of the probe. During its time orbiting the ringed world it has looked into the planet’s strange weather, and has also investigated Saturn’s many moons.
Among those moons is Titan, one of the few moons with an atmosphere and which his home to lakes of liquid methane.
The Sky at Night is on BBC Four at 22.00.