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In some sense the Voyager spacecraft have been leaving the solar system since launch. :) As the Nature article points out, Voyager 2 crossed the termination shock in 2007, entering the heliosheath. The recent announcement is about Voyager 2 exiting the heliosphere and entering interstellar space. Here's a nice graphic that shows the various regions - https://www.nasa.gov/sites/default/files/thumbnails/image/pi...

Someone has been counting: https://m.xkcd.com/1189/

I was wondering if I had deja vue over the probe leaving the solar system.

I came here to say this. I was sure I had read it before.

Voyager 2 is leaving the atmosphere!