Voyager 1 & 2: The Incredible Journey of the Farthest Spacecraft Ever

1A Once-in-a-Lifetime Planetary Alignment

In the late 1970s, Jupiter, Saturn, Uranus, and Neptune aligned in a way that only happens every 175 years. NASA seized this rare opportunity to launch two spacecraft that could visit all four giant planets using gravity assists — like cosmic slingshots — to speed from one planet to the next.

• Voyager 2 launched: August 20, 1977
• Voyager 1 launched: September 5, 1977 (on a faster trajectory)
• Voyager 1 reached Jupiter in 1979, Saturn in 1980
• Voyager 2 visited all four giant planets by 1989

2Incredible Discoveries at the Giant Planets

The Voyagers transformed our understanding of the outer solar system. They discovered active volcanoes on Jupiter's moon Io, a hidden ocean beneath Europa's icy surface, intricate ring structures around Saturn, and geysers on Neptune's moon Triton. These discoveries changed everything we thought we knew about our cosmic neighborhood.

3The Golden Record: A Message to the Stars

Each Voyager carries a Golden Record — a 12-inch gold-plated disc containing sounds and images from Earth. It includes greetings in 55 languages, music from Beethoven to Chuck Berry, sounds of nature, and 115 images of life on Earth. If an alien civilization ever finds a Voyager, they will learn about humanity.

• 55 languages saying "Hello" from Earth
• Music: Bach, Mozart, Beethoven, Chuck Berry, and more
• Sounds: Thunder, birds, whales, a baby crying, laughter
• 115 images: People, animals, landscapes, DNA structure
• Instructions on how to play the record etched on the cover

4Still Going After 47 Years

Voyager 1 is now over 24 billion kilometers from Earth — the farthest any human-made object has ever traveled. It entered interstellar space in 2012. Despite their age, both Voyagers still communicate with Earth, though signals take over 22 hours to arrive. Their nuclear power sources will keep them running until around 2030.