Voyager 2
On August 20th, 1977, Voyager 2 was launched. This is one of two twin spacecraft containing an encoded message with greetings in 55 languages, animal sounds, music from around the world, and images from Earth (link). The hope is that some future civilization will find it and know that (at some point) humans and other animals lived on Earth . She's currently 18h 57m 12s of light travel time from Earth . The chances of it being found by an advanced civilization are... slim
Source: Sagan, Carl. Cosmos. New York: Random House, 1980.
License CC BY 4.0
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!