Humanity for the most part tends to go about it's business here on earth, paying little attention to the huge universe outside of our atmosphere. But there have been three memorable efforts to cast little packages of information out into the void, like messages in a bottle. I find it inspirational and moving that these tiny bundles of data were hurled outward in the hopes of creating a tiny legacy for humanity, a kind of "we were here" proclamation to whomever might be out there, even though the odds of the messages being found at all border on the impossible.
The Pioneer Plaque
The Voyager Golden Record
The Arecibo Message