Published Nov 9, 2026 10:00 AM EST Voyager 1, the NASA space probe that has traveled farther from Earth than any other human-made object, is closing in on a remarkable milestone. Actually, let’s call it a 16.09-billion-milestone. That’s the distance a photon can travel in a single day, which is to say the Voyager 1 spacecraft will be exactly one light-day away from our planet on November 18 at 5:18 a.m. EST.