Voyager-1 left the Solar System, entered Interstellar Space

NASA's Voyager-1 spacecraft officially became the first human-made object to venture into interstellar space on 12th September. The 36-year-old probe is about 12 billion miles (19 billion kilometers) from our sun. During its journey Voyager 1 has travelled through plasma or ionized gas, present in the space between stars for about one year. At present the Voyager is in the transition region, outside of the solar bubble. This transition region still has evidences of the effects of the sun. The Voyager NASA mission is at a distance of 19 billion kilometer from home and thus a radio signal sent from the voyager takes 17 long hours to reach its receivers on the earth. Launched in 1977, Voyager was sent initially to study the outer planets, but then just kept on going.