NASA spacecraft recorded a jump in plasma density like Voyager 1 did on entering the interstellar medium in 2012.
and entered interstellar space have been revealed by scientists, with experts saying there is a"definitive boundary" between the two regions.
Voyager 2 was launched on August 20, 1977. In December last year, NASA announced the spacecraft had left the solar system, saying data returned suggested there had been a major change in the environment, with a marked increase in galactic cosmic rays and decrease in heliospheric particles from the Sun., scientists have now shown how the spacecraft experienced a jump in plasma density in a similar fashion as Voyager 1 did when it entered the interstellar medium in 2012.
Our solar system is surrounded by a protective, wind sock-shaped bubble known as the heliosphere. Within this is the heliosheath, which is where the solar wind from the Sun starts slowing down and interacting with the interstellar medium. The edge of the heliosphere is known as the heliopause and beyond this is interstellar space. Here, the Sun no longer has any influence over the environment.
Artist impression of the solar system and interstellar space. Voyager 2 left the solar system last year.Voyager 1 entered this interstellar space in 2012, with instruments on board showing changes to the magnetic field and a jump in plasma density. Plasma is ionized gas. In our solar system, it comes from the Sun. In interstellar space, it comes from the material ejected by stars that exploded millions of years ago.
With Voyager 2, the plasma instrument was undamaged. This meant scientists were able to show there was a significant change to the plasma surrounding it on November 5, 2018—suggesting this was the exact date Voyager 2 left the solar system. Voyager 1 left the solar system when it had traveled 122.6 AU—almost 11.5 billion miles. Voyager 2 left at a distance of 119.7 AU—just over 11 billion miles.
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