Voyager 2 is the only spacecraft to have conducted in-situ exploration of all four giant outer planets: Jupiter, Saturn, Uranus, and Neptune. On November 5, 2018, it crossed the heliopause into interstellar space, carrying a still-functioning Plasma Science instrument that directly samples interstellar wind density and temperature.
| Sensor | Subsystem | Scientific Measurement Function | State |
|---|---|---|---|
| CRS | Cosmic Ray Subsystem |
High-energy cosmic ray isotope and proton detector.
|
Active |
| LECP | Low-Energy Charged Particle |
Trapped and free ion flux measurements.
|
Active |
| MAG | Dual Magnetometers |
Deep space interstellar magnetic field orientations.
|
Active |
| PLS | Plasma Science Experiment |
Measures interstellar ion temperature, density, and velocity vector.
|
Active |
| PWS | Plasma Wave Subsystem |
Low-frequency electric wave fields in local interstellar gas.
|
Active |