<P> After completing its primary mission with the flyby of Saturn on November 12 , 1980 , Voyager 1 became the third of five artificial objects to achieve the escape velocity that will allow them to leave the Solar System . On August 25 , 2012 , Voyager 1 became the first spacecraft to cross the heliopause and enter the interstellar medium . </P>
<P> After completing its primary mission with the flyby of Saturn on November 12 , 1980 , Voyager 1 became the third of five artificial objects to achieve the escape velocity that will allow them to leave the Solar System . On August 25 , 2012 , Voyager 1 became the first spacecraft to cross the heliopause and enter the interstellar medium . </P>
when did voyager 1 cross into interstellar space
when did voyager 1 cross into interstellar space
August 25 , 2012
August 25 , 2012