Two spacecraft, launched in 1977, still talking to us from interstellar space. Ride their real paths and see what they saw, with NASA's own photos.
Every moment in the ride, in order. Tap one to fly there.
It leaves Cape Canaveral 16 days before its twin, on a slower path that will reach all four giant planets. On board: the Golden Record.
A faster path. By mid-December it has overtaken Voyager 2 in the asteroid belt, and it has led ever since.
Thirteen days out, it turns its camera back: Earth and the Moon in one frame, for the first time ever.
It passes 349,000 km from Jupiter's centre at 29 km/s. It finds erupting volcanoes on Io, the first ever seen beyond Earth, and a faint ring around Jupiter.
Voyager 2 swings past at 721,000 km from the centre and maps Europa, whose cracked ice hints at an ocean underneath.
It skims 4,100 km above Titan's orange haze, then passes Saturn the same day. The Titan pass bends its path up and out of the planets' plane for good.
Voyager 2 passes 100,000 km above Saturn's clouds and uses the planet's gravity to aim for Uranus.
The only visit Uranus has ever had: 81,500 km above the clouds. Voyager 2 finds 10 new moons and two new rings.
The last planet. Voyager 2 passes about 4,950 km above Neptune's north pole, its closest pass of the whole journey, then flies by the moon Triton.
Looking back three days later: the thin crescents of Neptune and Triton. There are no more planets ahead.
From 6 billion km, Voyager 1 takes the first portrait of the Solar System. Earth is less than a pixel. Minutes later its cameras are switched off for good, to save power and memory.
It overtakes Pioneer 10 at about 69 AU from the Sun. Nothing people have built has ever been farther away.
The solar wind, which streams out from the Sun faster than sound, suddenly slows and piles up. Voyager 1 crosses into this turbulent outer layer at 94 AU.
Voyager 2 crosses it too, at about 84 AU, closer in because the Sun's bubble is not round.
At 121 AU, Voyager 1 leaves the bubble of the Sun's wind: the first human-made object in the space between the stars. Scientists confirmed it a year later, from the way the plasma around it rang.
Voyager 2 follows at 119 AU. Its plasma instrument still works, so it measures the boundary directly for the first time.
A command tilts Voyager 2's antenna 2 degrees away from Earth and contact is lost. On 4 August the team "shouts" the fix from Australia and it turns back.
Voyager 1's flight data computer starts sending nonsense. The team traces it to one failed memory chip, from 24 billion km away.
After moving code around the broken chip, the team sees usable data from Voyager 1 again.
A signal from Voyager 1 now needs a full day to reach us. It is the first thing people have made to go one light-day from Earth: 25.9 billion km.
Sources: NASA JPL Horizons (positions, flyby distances, worked out for this page), NASA/JPL Voyager mission pages and the NASA Image and Video Library (events and photos). The light-day time is NASA's.