Voyager 1 and 2 launched in 1977 on a Grand Tour that comes once every 176 years. How they mapped Jupiter, Saturn, Uranus and Neptune — and carried the Golden Record.
Voyager 1 and 2 launched in 1977 with 1970s tech. 47 years later, they're in interstellar space and still sending data. How their RTGs, radios and heliopause crossing work.