Voyager 1 will have traveled one full light-day from Earth on Tuesday, November 17. Credit: NASA

Back in 1998, NASA ’s Voyager 1 spacecraft became the farthest human-made object to ever travel beyond Earth. That technically means the intrepid explorer has been constantly breaking its own record for the last 18 years. But on November 18 (at 5:18 a.m. EST, to be exact), Voyager 1 will set a very specific and significant major record. At that point, it will officially be exactly one light-day away from its home planet. This means all future communications with the craft will take at least a full 24 hours to both send and receive.

It’s a monumental achievement for a piece of equipment originally intended to only survive only a few years in deep space, so why not celebrate the moment with NASA? The agency recently announced Shine Bright for Voyager’s Light-Day , a worldwide event in which participants are encouraged to illuminate the night sky.…