. >> the sheer traffic on twitter has made it an inning defense benindispensabletool. news and entertainment. twitter has changed the what i with he learn about the world. once it's listed pima will be able to buy in and capitalize on it. one hashtag at a time. gerald, al jazerra. >> more than three decades after take off a nasa probe has become the first man-made object to leave the solar system. this is the moment joiner one was launch in '77. it was sent to study the planets in our solar system. during the 80s it surveyed many planets, voyager one then turned it's its cameras to lookn on earth. the probe contains old records evened with music and images from earth in case it's found by intelligent life. the chief scientist says the probe is teaching us about the furthest reaches of our solar system. >> well, the sun creates a bubble around itself that en involves all the planets and provides a short of a shield between us and what is outside interstellar space and the stars. this is the first time a space craft left the bubble so we can determine what is really out