Voyager Enters Solar System's Final Frontier

NASA's Voyager 1 spacecraft has entered the solar system's final frontier, a vast, turbulent expanse where the Sun's influence ends and the solar wind crashes into the thin gas between stars.
The Voyagers are identical but on different flight paths. Voyager 1 is about 8.7 billion miles from the Sun and traveling at a speed of 3.6 AU per year while Voyager 2is about 6.5 billion miles away and moving at about 3.3 AU per year. One 'AU' equals the distance between the Sun and Earth, or 93 million miles. In July 2004 scientists used Voyagers to track a solar blast to the edges of the solar system. http://www.nasa.gov/vision/universe/solarsystem/voyager_agu.html