On November 18, 2026, NASA’s Voyager 1 spacecraft will reach one light-day from Earth. Traveling for nearly 50 years, it becomes the first human-made object to cross this immense 16-billion-mile marker.
Image credit: NASA ScienceLaunched in 1977, Voyager 1 and Voyager 2 took separate routes. While Voyager 1 raced outward, Voyager 2 visited Uranus and Neptune, and will reach its own light-day milestone in November 2035.
Image credit: NASA ScienceNothing travels faster than light, moving through space at about 186,000 miles per second. A light-day measures the distance light or radio waves travel in 24 hours, equaling roughly 16.09 billion miles.
Image credit: NASA ScienceLight crosses the distance to our Moon in 1.3 seconds and reaches Earth from the Sun in 8.3 minutes. Even distant Neptune lies just four light-hours and 10 light-minutes away from us.
Image credit: NASA ScienceAstronomical vastness demands larger units like light-years. Proxima Centauri, the nearest neighbor solar system, rests 4.24 light-years distant, while the Andromeda galaxy spans 2.5 million light-years away from Earth.
Image credit: NASA ScienceUnits from daily life fail when measuring the deep universe. As distances expand into billions and trillions of miles, expressing location in time traveled by light becomes essential for deep space exploration.
Image credit: NASA ScienceDespite cruising at nearly 38,000 miles per hour, Voyager 1 moves slowly compared to light. Crossing one light-day required 49 years, two months, and 11 days of continuous flight.
Image credit: NASA ScienceVoyager 1 is traveling toward star AC +79 3888, also known as Gliese 445. It will pass within 1.7 light-years of this constellation Ursa Minor star in about 40,000 years.
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