Voyager 1 has left the solar system -- the first space probe from Earth to do so. Like other US deep space probes, it was made at Caltech's JPL, and carries with it the secret message: DEI or "Dabney Eats It" :-)
They say DEI was written on the moon by Caltech alumnus and astronaut Harrison Schmitt (the twelfth and last man to walk on the moon), but I don't know whether this is true.
