Voyager 1 vs Voyager 2: A Side-by-Side Comparison

Voyager 1 and Voyager 2 are NASA's twin interstellar probes, both launched in 1977 — but they took dramatically different routes through the solar system, and one is now far ahead of the other. Here's exactly what's different.

Why Voyager 1 Is Farther Despite Voyager 2 Launching First

Voyager 2 launched first, but Voyager 1 took a more direct route. After Saturn, Voyager 1 was redirected by Saturn's gravity to study the moon Titan up close — a maneuver that flung it out of the plane of the planets at a steep angle and gave it a higher escape velocity. Voyager 2, meanwhile, followed the longer "Grand Tour" route, slowing through Uranus and Neptune before heading out. Voyager 1 has been outpacing its twin ever since.

Side-by-Side Specs

What Each Voyager Uniquely Discovered

Voyager 1's unique discoveries: Active volcanoes on Io (the first found beyond Earth); the complex structure of Saturn's rings up close; the first detailed images of Titan's hazy atmosphere; the famous "Pale Blue Dot" photograph; and — most importantly — the only direct measurements of plasma density in interstellar space.

Voyager 2's unique discoveries: The only spacecraft ever to fly past Uranus (1986) and Neptune (1989). Discovered 11 new moons of Uranus, Neptune's Great Dark Spot, geysers on Triton, and the first close-up evidence that Uranus rotates on its side. Detected a 60-degree tilt in Neptune's magnetic field.

Are Both Voyagers Still Working?

Yes — but barely. Both spacecraft are running on declining nuclear power and need to shut down instruments year by year to extend the mission. NASA estimates both will lose the ability to transmit data by the early 2030s. After that they will continue traveling forever, silently, carrying the Golden Record toward other stars.