Cassini, Saturn, and radiation
Hmm, interesting point about Cassini's lifespan. Looks like Voyager will last 50 years so not impossible.
For Galileo, the life limiting factor was radiation, right? How does Cassini's expected radiation exposure compare?
I suppose the tape recorder also was a limiting factor for Galileo that won't affect Cassini, which is all solid state memory if I remember correctly.