re: You mean more artifacts, don't you?
And Pioneer 11 and Voyagers 1 and 2. BTW, did their last rocket stages also head out into interstellar space?
As for Scott's comment on sending artifacts into the galaxy so that others may know we existed (or existed), this is one reason I can see ETI (and ourselves) broadcasting into the Universe, to preserve their culture via other civilizations in the event they were dying. See James Gunn's 1972 SF novel The Listeners for an example of this.