The heliopause remains an unknown distance ahead. On December 10, 2007, instruments on board Voyager 2 sent data back to Earth indicating that the solar system is asymmetrical. It has also reached the termination shock, about 10 billion miles from where Voyager 1 first crossed it, and is ...
JPL planners began to study Voyager-class missions in 1961, followed by a May 1962 study of advanced missions and spacecraft. These came to two conclusions -- that too little was known about the atmosphere of either planet to design a lander at that time, and the largest wish-list of ins...