An awesome comic at XKCD sums it up pretty well…
So far Voyager 1 has ‘left the Solar System’ by passing through the termination shock three times, the heliopause twice, and once each through the heliosheath, heliosphere, heliodrome, auroral discontinuity, Heaviside layer, trans-Neptunian panic zone, magnetogap, US Census Bureau Solar System statistical boundary, Kuiper gauntlet, Oort void, and crystal sphere holding the fixed stars.
Don’t worry.. this is not one of the two posts I promised this week..
Information Source: Jet Propulsion Labs Website