Luckily, we live in this universe, where Voyager 1 has been trucking along for 45 years—nine times longer than the original plan. It’s flown by Uranus and Neptune, and it even eventually ...

Voyager 1 left the heliosphere and reached interstellar space in August 2012 and is 15.5 billion miles away, and Voyager 2 − traveling slower and in a different direction − did the same in ...