Heliosphere by scottishnatureboy published on 2020-02-22T17:59:47Z It has been a long time since I added a new track in my series of tunes called The Music of the Spheres, inspired by the various ‘spheres’ we use to delineate and define our world and beyond. The sphere in this tune is definitely ‘beyond’. The heliosphere is (according to Wikipedia) the ‘vast, bubble-like region of space which surrounds and is created by the Sun. In plasma physics terms, this is the cavity formed by the Sun in the surrounding interstellar medium. The "bubble" of the heliosphere is continuously "inflated" by plasma originating from the Sun, known as the solar wind. Outside the heliosphere, this solar plasma gives way to the interstellar plasma permeating our galaxy.’ To date, only two human objects, the two Voyager spacecraft, have travelled beyond the heliosphere. The two Voyager programme spacecraft have explored the outer reaches of the heliosphere, passing through the termination shock and the heliosheath. NASA announced in 2013 that Voyager 1 had encountered the heliopause on 25 August 2012, when the spacecraft measured a sudden increase in plasma density of about 40 times. 2018, NASA announced that Voyager 2 had traversed the heliopause on 5 November of that year. As the heliopause marks the boundary between matter originating from the Sun and matter originating from the rest of the galaxy, the two Voyagers, having departed the heliosphere, can be said to have reached interstellar space! Genre Electronic