NASA's Voyager program consists of two spacecraft, Voyager 1 and Voyager 2, launched in 1977 to explore the outer planets of our solar system. They provided groundbreaking data about Jupiter, Saturn, Uranus, and Neptune, capturing stunning images and revealing new information about their atmospheres, moons, and rings. Both spacecraft are now in interstellar space, continuing to send back data about cosmic rays and magnetic fields. Voyager 1 is the farthest human-made object from Earth, while Voyager 2 is the only spacecraft to have visited all four giant planets.