Voyager 1 was launched in early September 1977.
Voyager was the second spacecraft to fly past Jupiter, and the first to take close-up photos of Jupiter’s moons. It flew on past Saturn, and examined Saturn’s moon Titan, the only moon with an atmosphere. And then it flew onwards, on and on, for another forty years. It officially left the Solar System and entered interstellar space in 2012. It just kept going, further and further into the infinite emptiness
Voyager kept going, and kept going, until it was over 15 billion kilometers away. At the speed of light, the Moon is one and a half seconds away. The Sun is about 8 minutes away. Voyager is twenty-two hours away. Send a radio signal to it at lunch on Monday, and you’ll get a response back Wednesday morning.