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= Answer = None The following spacecraft have passed the last known body, ie Pluto Pioneer 10 and 11 Voyager 1 and 2 New Horizons will leave the solar system after flying past Pluto in July 2015. The solar system does not really end with Pluto. Besides the planets, there is a thin haze of dust (some of it bunched into comets). Any of this dust that is nearer to the Sun than to any other star may be in the gravitational hold of the Sun and so counts as part of the solar system. Voyager 1 is now near the Sun's heliopause [See Link]. The heliopause is the theoretical boundary where the Sun's solar wind is no longer great enough to push back the stellar winds of the surrounding stars. = Answer = It is true that none of the 5 spacecraft have to date left the physical environment of the solar system, however all 5 of them have sufficient kinetic energy to escape the Sun's gravity. Their escape from the solar system is therefore guaranteed, nothing that man or nature can do, short of an asteroid impact, can stop them from leaving the solar system. By having acquired sufficient velocity to exceed solar escape velocity, they can be said to have left the solar system. Even New Horizons, which will not complete its Pluto reconnaissance mission until 2014, has already escaped from the solar system.

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