NASA Announces Voyager 1 Will Reach One Light-Day Distance From the Sun in November 2026
NASA announced that the Voyager 1 spacecraft will reach a distance of one light-day from the Sun on November 18, 2026. Launched in 1977, the probe is now more than 16 billion miles away from Earth. A light-day measures distance rather than time, marking how far light travels in 24 hours. Voyager 1 crossed the heliopause in August 2012 to enter interstellar space, while its twin Voyager 2 crossed in November 2018. Both probes carry a Golden Record containing Earth sounds, images, and greetings in 55 languages. NASA continues to communicate with the probe through its Deep Space Network using the Canberra antenna in Australia. This milestone offers everyday readers a clear sense of scale for human space exploration, showing how far a spacecraft built nearly five decades ago has traveled beyond the planets of our solar system.
What was announced
NASA published skywatching notes showing that the Voyager 1 spacecraft will cross the one-light-day milestone on November 18, 2026. This point sits 16.1 billion miles from the Sun, or about 25.80 billion kilometers. The probe launched 49 years prior in 1977 alongside its twin, Voyager 2. Both spacecraft used a rare alignment of Jupiter, Saturn, Uranus, and Neptune that occurs once every 175 years. Using six gravity assists between them, the twin probes completed visits to the outer giant planets before moving on separate paths through space.
What it means
A light-day is a unit of distance showing how far light travels in 24 hours. When Voyager 1 reaches this mark, sunlight will take a full day to reach the probe. NASA tracks both craft using the Deep Space Network, relying on an antenna in Canberra to keep contact with Voyager 1. The spacecraft has been traveling in interstellar space since August 2012, when it passed the heliopause where solar winds meet interstellar material. Voyager 2 crossed this same boundary in November 2018. Each spacecraft carries a copper and gold-plated phonograph record protected by an aluminum cover electroplated with uranium-238, an isotope with a half-life of 4.468 billion years.
What the announcement does not tell us
The announcement does not explain how much electrical power remains on Voyager 1 or Voyager 2. It does not say how many scientific instruments are still functioning on either probe today. NASA does not state when the craft will run out of power entirely or lose the ability to send data back to Earth. The update also omits details about signal delay times for two-way communications or specific upcoming milestones for Voyager 2.
How this was written
This analysis was written with AI from the official announcement below, using only facts that announcement states. The quoted wording is NASA News Releases’s own. Always check the original before acting on anything here.
Twin Travelers In 1977, NASA launched twin spacecraft Voyager 1 and 2, taking advantage of a once-every-175-year planetary alignment of the four largest planets in our solar system: Jupiter, Saturn, Uranus, and Neptune. Using six gravity assists between them, this Grand Tour gave us up-close views of the gas and ice giants, including several moons. […]
Opens science.nasa.gov
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