Voyager I Speeds Towards the Brink of Interstellar Space
"The Voyager 1 spacecraft is 11 billion miles from the sun. And every minute, it gets 636 miles closer to its 
destination: the frontier of interstellar space."
"The craft is currently in what NASA calls, not undramatically, "the boundary between the solar wind from the Sun and the interstellar wind from death-explosions of other stars," an area that astrophysicists also call, less dramatically, a stagnation layer."
"When Voyager 1 crosses that threshold, it'll become the first man-made object to do so. That feat, along with the recent discovery of Kepler-22b, a potentially inhabitable planet, means that it's an exciting time to be an astrophysicist. Now, NASA and its two Voyager craft are heading into the great beyond."