Voyager 2 Bids Adieu To The Heliosphere, Entering Interstellar Space

A NASA illustration depicts the positions of both Voyager 1 and Voyager 2 probes, now outside the heliosphere. Voyager 1 left the heliosphere in August 2012, while Voyager 2 left at a different location last month.

The milestone makes the 41-year-old NASA probe just the second human-made object, after Voyager 1, to reach such distant regions. Now, Voyager 2 is over 11 billion miles from the sun — and counting.

(Image credit: NASA/JPL-Caltech)