The Voyager 1 interstellar probe, part of NASA's Voyager program launched in 1977, will reach one light-day distance from Earth next week.

This article puts the distance into perspective.

"That span stretches about 16.1 billion miles in space. Set out on foot at a brisk 3 mph, and you'd need roughly 612,000 years to walk it."

https://mashable.com/science/voyager-1-light-day-explained

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