The Voyager 1 spacecraft was launched on September 5, 1977 and, although it has concluded its primary activity, the spacecraft is still in operation and currently is located 22 billion and 590 million km from the Sun, becoming in fact the most terrestrial object away from Earth. The primary task of Voyager 1 was already to reach Jupiter and Saturn (it will succeed in 1979 and 1980) discovering important news concerning not only the two gas giants, but also concerning their numerous satellites. Data from December 2012 sent by the spacecraft demonstrate new and sensational discoveries of the solar system's boundaries. The probe has entered a "magnetic highway" connecting the solar system to interstellar space. This "highway" would appear to be a link between the sun's magnetic field and the interstellar magnetic field. All this allows the charged particles inside the heliosphere to come out and the charged particles from the outside to pour in. Therefore Voyager 1 is analyzing charged particles from outside the solar system. But experts believe that the magnetic field data does not suggest that it is already in interstellar space, as the direction of the magnetic field lines should change when they are not. The spacecraft allegedly entered the magnetic highway on July 28, 2012, and since then this region has drifted away and rejoined it many times. The spacecraft finally returned there on August 25, 2012. On September 12, 2013, NASA confirmed that on August 25, 2012, Voyager 1, at a distance of about 121 AU from the Sun, officially entered interstellar space. Voyager 1 is still functional and is the farthest man-made object from Earth having passed the Pioneer 10 probe.

The travell in Interstellar Space

In 2013, Voyager 1 reached interstellar space and as of November 9, 2020 it is at a distance of 151.002 AU (equivalent to 20.931 light hours or 22.590 billion km) from the Sun. The probe is moving away from the solar system at a speed of 16.9995 km / s, or more than 3.5 AU per year; is in very slight slowdown due to solar attraction. In 2018, thrusters were activated again after 37 years of inactivity that will be able to extend the mission. Voyager 1 is powered by an RTG battery that will allow it to function, albeit to a limited extent, until 2025 when it has reached more than 25 billion kilometers from Earth. According to forecasts, Voyager 1 could reach and analyze the hypothetical hydrogen wall (located between the heliopause and the bow shock), but it will be impossible that the probe is still functional when it reaches the bow shock located at about 230 AU from the sun; assuming that it travels at its current speed, it can be estimated that this zone will be reached in 2042, but in reality it will take longer due to the progressive slight slowdown of the probe. In about 30,000 years, Voyager 1 will completely exit the Oort Cloud and enter the gravitational pull field of another star. The spacecraft is heading in the direction of the constellation Ofphiuchus and in about 38 000 years it will pass at a distance of about 1.7 light years from the star Gliese 445 located in the constellation of Giraffe.