Voyager 1 and 2 have been drifting through space for over 45 years, still whispering back signals from beyond the solar system. But their real legacy? Long after Earth is gone—billions of years from now—they’ll still be out there. They’re made of metal and plastic, materials that don’t decay in the vacuum of space. Even when the Sun dies, when the Milky Way collides with Andromeda, those little probes will keep floating. If aliens ever find them, they’ll be holding a message from a species that might not exist anymore. Kind of eerie, right?