How Cassini probe reached Saturn
It took seven years for the US-European mission Cassini-Huygens just to get to the ringed planet, Saturn.
This animation shows that journey and how the probe used gravitational flybys of both Venus and Earth.
The animation was made for a Horizon documentary that will review the mission and its final hours. It will be broadcast on Monday 18 September at 21:00 BST on BBC Two.