What happens to Cassini when the Saturn tour is over after four years?
The spacecraft will continue to orbit Saturn until it runs out of fuel, which could take many decades. There could be enough fuel and power for Cassini to take and relay data for a quite a while. However, budgetary limits will dictate how long after June 20, 2008 it will operate. When it runs out of fuel, it will spin up and break apart.
