The Little Space Probe That Could
I'm not referring to Curiosity, trundling around in Mars - but rather the Grandaddy of space probes, Voyager. Voyager 1 and 2 are still going, still communicating with Earth, and are expected to do so for perhaps another 10 years. Voyager 1 has been chugging along for 35 years and is around 11 billion miles from the Sun, about to leave our solar system for ever. We got the first great close up views of several planets from the little probes, and Voyager 1 also gave us the famous "Pale Blue Dot" photo about which Carl Sagan waxed so eloquently. From Wikipedia:
Each Voyager space probe carries a gold-plated audio-visual disc in the event that either spacecraft is ever found by intelligent life-forms from other planetary systems. The discs carry photos of the Earth and its lifeforms, a range of scientific information, spoken greetings from people (e.g. the Secretary-General of the United Nations and the President of the United States) and a medley, "Sounds of Earth", that includes the sounds of whales, a baby crying, waves breaking on a shore, and a collection of Earth music, including works by Mozart and Chuck Berry's "Johnny B. Goode".