NASA’s Voyager 1 will be exactly one ‘light-day’ from Earth around 13 November in 2026. Light-day is the distance light, or any electromagnetic radiation, including radio waves, travels in a vacuum in 24 hours. Launched on September 5, 1977, it has been travelling for over 48 years and has managed to remain operational and intact for such a long time. When it reaches one light-day, it will be a huge milestone, as it will showcase a mix of physics, engineering history, and a striking reality check on the scale of our universe.
