Astronomy Today@astronomytodayNASA is asking people to flash Morse code at Voyager 1 on November 17, a day before the probe reaches one light-day from Earth. That is the most remote spot any human-built craft has reached.
Any lamp will do, from a flashlight to a phone, and NASA provides a Morse flasher for phones and tablets.
At 5:16 a.m. EST on November 18, Voyager 1 should be about 16.09 billion miles (25.9 billion km) away, so a one-way message would need a full day to arrive. Sharing photos and videos of the flashes is encouraged.
