The Voyager 2 spacecraft is the second human-made object which ever managed to exit the heliosphere and enter interstellar space. It all happened about a year ago.
NASA states that the mission of Voyager 2 revealed new information about the border between our solar system and interstellar space. Officially, interstellar space is the area that’s no longer affected by the sun’s flow of material and magnetic field. This area is located about 18 billion kilometers from our planet.
Voyager 2 discovered unexpected differences of the density of plasma and the existence of a set of charged particles.
NASA says that both Voyager 1 and Voyager 2 are located around an area of transition, beyond the heliosphere, which acts as a protective barrier for our solar system. The barrier consists of solar wind originated from charged particles. The heliopause is known as the area where interstellar space begins (and solar wind ends).
Data from Voyager 2 might prove that the heliopause might be a lot thinner than it was previously believed.
Voyager 2 also proved the existence of a “magnetic barrier” at the outer shell of the heliosphere. This barrier was predicted by scientists and Voyager 1 even managed to observe a glimpse of it.
Voyager 2 worked a bit like a plausibility device for Voyager 1: Scientists used data from Voyager 2 to verify if data provided by Voyager 1 was characterizing the entire heliosphere or just the certain location where the probe was located.
Cosmic rays (particles which hit our planet from beyond its atmosphere) were also detected by Voyager 2, who discovered that the intensity of the rays and the distance to the heliopause are reversely proportional.