Mark the date, Wednesday, November 18th, on your calendar. That is the day NASA's interstellar space probe, Voyager 1, reaches a milestone, achieving a distance from Earth of one light-day. Simply put, that's how far a photon can travel in a single day. The big moment is expected to happen at 5:18 a.m. US Eastern Time. So if you're planning to send a radio signal from your shack to Voyager 1 in the hopes of a QSO, have patience: Your message will take 24 hours to get there - and another 24 hours for the QSL to arrive back home.
