The history of spaceflight is filled with great images, such as Neil Armstrong setting foot on the Moon or Viking 1’s first images from Mars, but some of the most dramatic events haven’t any images to accompany them. As NASA's two Voyager spacecraft leave the Solar System, there won’t be any historic pictures sent back. Instead, that invisible boundary between our system and interstellar space will be marked by readings taken by the instruments of the spacecraft. NASA has placed a readout on the Voyager mission home page that shows two of three key factors that will let the public know when this momentous milestone has been reached.
Read the full article: NASA lets public track when Voyager spacecraft leave the Solar System