Voyager 1 is the most distant human-made object in history. Launched in 1977, it completed historic flybys of Jupiter and Saturn before crossing the heliopause into interstellar space on August 25, 2012. It continues to return in-situ measurements of the pristine interstellar plasma medium and galactic cosmic rays powered by its Radioisotope Thermoelectric Generator (RTG).
| Sensor | Subsystem | Scientific Measurement Function | State |
|---|---|---|---|
| CRS | Cosmic Ray Subsystem |
Measures galactic cosmic ray flux and interstellar energy spectra.
|
Active |
| LECP | Low-Energy Charged Particle |
Samples low-energy interstellar ions and electrons.
|
Active |
| MAG | Triaxial Fluxgate Magnetometer |
Measures the magnitude and direction of the local interstellar magnetic field.
|
Active |
| PWS | Plasma Wave Subsystem |
Detects thermal electron density oscillations in interstellar plasma.
|
Active |