Voyager 1 reached the heliopause in 2012, followed by Voyager 2 six years later, confirming the heliosphere isn’t actually a perfect sphere.
Nothing manmade has reached further from Earth than the Voyager series of spacecraft. Hurtling away from the sun at 38,000 miles an hour, the duo have now traveled over 12 billion miles, with Voyager 1 set to be a light-day from Earth by the end of t... [3043 chars]