You can read about the Visions of Mars DVD here:

http://www.planetary.org/programs/projects/messages/vom.html

Even if something happens to Phoenix, hopefully the disk will survive long enough
for future explore to find and play it. The disk may even have items lost by that
time which our descendants would not have otherwise.

This is why I advocate putting some kind of significant message on every deep
space mission, more than the gimmick of lots of signatures, to be sure.

For example: The Rosetta mission to land a probe on a comet in 2014 carries a
disk with thousands of human languages on it, more than a few of which may be
otherwise extinct by the time it is found. Future historians, linguists, and certain
culture will be very grateful they were preserved in this manner, away from our
planet and its long record of destroying the past.

http://www.rosettaproject.org/