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Voyager 1 to Reach One Light‑Day From Earth

The milestone will create a 24‑hour one‑way radio delay that highlights the spacecraft’s shrinking power supply and the limits it places on mission control.

Overview

  • The spacecraft will reach a distance of one light‑day from Earth on Wednesday, November 18, 2026, at the time published by mission teams, making it the most distant human‑made object.
  • At roughly 25,902 million kilometres and a speed near 61,000 km/h, signals from Voyager 1 will take 24 hours to reach Earth and a full command‑response cycle will need about 48 hours.
  • Engineers completed an energy‑saving reconfiguration in September 2026 and are still investigating a brief loss of contact during two failed attempts on October 18–19 after the signal returned on October 20.
  • Only two of Voyager 1’s original ten instruments remain active—the magnetometer and the plasma‑wave detector—because the probe’s three radioisotope thermoelectric generators lose about four watts of power each year.
  • A small JPL team uses the Deep Space Network and weekly commands to keep the nearly 50‑year‑old mission running while its scientific returns and cultural payloads, including the Golden Record and the Pale Blue Dot image, continue to shape its legacy.