Deep Space Fleet Telemetry

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).

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.

New Horizons conducted the first-ever close flyby of Pluto and its moons in July 2015, revealing nitrogen glaciers, towering water-ice mountains, and an active cryosphere. In 2019, it conducted the most distant planetary flyby in history at contact-binary planetesimal Arrokoth. It is currently cruising through the deep Kuiper Belt conducting heliophysics, dust, and astrophysics sky-background observations.