1. The Legendary Journey
- Voyager 2, launched in 1977, has traveled over 12 billion miles (20 billion km) from Earth.
- Itâs the only spacecraft to visit all four giant planets â Jupiter, Saturn, Uranus, and Neptune.
- In 2018, it crossed the heliopause â the invisible boundary where the Sunâs influence ends, and interstellar space begins.
2. The âImpossibleâ Encounter
Recently, Voyager 2âs instruments picked up data that stunned scientists:
- Cosmic Rays Surge:Â Radiation levels outside the heliosphere were far stronger than expected.
- Plasma Waves Detected:Â Voyager 2 âheardâ low-frequency plasma vibrations from the interstellar medium, something long thought impossible at such faint levels.
- Magnetic Field Anomaly:Â Instead of dispersing smoothly, the interstellar magnetic field bent sharply at the heliopause, almost as if Voyager had hit a âwall.â