Final answer:
The mission of Voyager 1 and 2 was to explore Jupiter, Saturn, Uranus, and Neptune, and send back detailed images and scientific data. Voyager 1 became the first human-made object to reach interstellar space and continues to send information back to Earth.
Step-by-step explanation:
The long-term mission for the Voyager 1 and 2 spacecraft was to conduct a grand tour of the outer planets, a mission that involved flying by Jupiter, Saturn, Uranus, and Neptune to capture detailed images and gather diverse scientific measurements, expanding our knowledge of these distant worlds. Launched in 1977, Voyager 1 and 2 have provided invaluable data and are the most distant human-made objects, with Voyager 1 specifically being the first to enter interstellar space. Despite its initial mission, Voyager 1 has vastly exceeded expectations, continuing to relay data back to Earth as it journeys through space, and it's expected to continue until at least 2025.