October 7, 2018

Graphics showing heliosphere with the Voyager probes' positions (Image NASA/JPL-Caltech)

NASA announced that its Voyager 2 space probe could be close to interstellar space. Approximately 17.7 billion kilometers (almost 11 billion miles) from the Sun, it detected an increase in cosmic rays coming from outside the solar system, one of the criteria already used in the past to assess whether its twin Voyager 1 had reached interstellar space, an event confirmed in September 2013. The route of the two probes is different and is the reason why one of the two probes is farther than the other and the heliosphere doesn’t have a fixed size so NASA’s monitoring is continuing but there are no certainties yet.