Voyager 2 hasn't really left the solar system (Score 4, Informative)

Voyager 2 has entered interstellar space (i.e. crossed the heliopause, the boundary where the Sun's solar wind is stopped by the interstellar medium), but it hasn't left the solar system (the spherical area of space gravitationally bound to the Sun). The Oort Cloud, by current estimates, extends 10-2,000 times farther out than Voyagers 1 & 2 are now. The probes are expected to reach the inner edge of the Oort Cloud in ~300 years. The popular idea of the solar system ends at Pluto, but we know of many objects orbiting far beyond that.