it's carrying the famous "Golden Record" with sounds and images of earth, just in case anything out there ever finds it.
its power source is a radioactive decay generator, not solar panels, since sunlight is way too weak out there. it's expected to finally go quiet sometime in the 2030s.
crossed the heliopause (basically where the sun's influence ends and interstellar space begins) back in 2012, first human-made object to ever leave the solar system. it's STILL transmitting data today, over 15 billion miles away, running on decades-old tech, kind of insane honestly.