2nd Satellite crossed solar limit
On 10th of December, 2018, Voyager-2 became second man-made object to enter interstellar space, after Voyager-1. Voyager-1 crossed solar limit on 25th August, 2012. 
Facts about Voyager-2:
Voyager-2 was launched earlier than Voyager-1.
Voyager-2 became first spacecraft to visit all the 4 outer planets.
On 13th August, 2013, Voyager-2 became NASA’s longest operating mission, beating Pioneer 6’s record of 12,758 days.

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