2 man-made objects roaming the interstellar region
Today at the #agu2018 meeting in #washingtondc #nasa made a historic announcement about the #voyager missions. Voyager2 has successfully crossed the heliosheath joining its twin, which made the same journey 6 years ago, in the interstellar medium.
While the Voyager missions have crossed the heliosphere it is still inside the solar system. Existence of an Oort cloud, collection of small objects and the origin of comets, is hypothesised to exist about 1000AU (#astronomicalunit) from the #sun. It will take another 300 years for Voyager2 to reach the inner edge of the Oort Cloud and possibly 30,000 years to fly beyond it.
At the time of launch, scientists expected the Voyagers to last no more than 5 years and yet these missions have surpassed everything man has imagined. They have given us insight into the outer planets, their moons and made new discoveries about the last reaches of the #solarwind. These discoveries have been instrumental in rewriting textbooks. With its 41 year journey Voyager2 is the longest running mission by NASA.
Each #spacecraft carries a #goldenrecord of #earth sounds, pictures and messages. They are time capsules and could one day be the only traces of human civilization.
#voyager #voyager2 #nasa #manmade #satellite #heliosphere #agu2018 #interstellar #oortcloud