"Scientists say reports last summer that NASA's long-lived Voyager 1 space probe had finally left the solar system have turned out to be a bit premature.
Rather, the spacecraft, which was launched in 1977 for a five-year mission to study Jupiter and Saturn, has found itself in a previously unknown region between the outermost part of the solar system and interstellar space...
Voyager 1 is now about 18 billion kilometres from Earth. At that distance, it takes radio signals, which move at the speed of light,
17 hours to make a one-way trip to Earth."
http://www.abc.net.au/news/2013-06-2...-space/4786910
http://www.jpl.nasa.gov/news/news.php?release=2013-209
(Neptune's radio signals take
4 hours to make a one-way trip to Earth.)
