NASA’s researchers say the formation can be detected by the New Horizons spacecraft.
The hydrogen wall is located at the outer edge of our solar system. This is the place where the sun-generated bubble is no longer strong enough to stop the interstellar material coming into the inner region and thus accumulates in this space. Due to this phenomenon, a clearly visible interface is formed: solar wind produces its effect and keeps the interstellar material away, while the other side contains the interstellar material, a major part of which is hydrogen.
According to NASA, the New Horizons spacecraft instruments that Pluto will visit in 2015 have managed to “see” this boundary, precisely the extra ultraviolet radiation emitted by the space wall. Similarly, in 1992, the two most distant spacecraft Voyager-1 and -2 too.
The latter two satellites, even released in the 1970s, have not yet been sufficiently developed to make sure that the research devices actually detect the radiation of the wall. However, the New Horizons Alice instrument is much more sensitive so it can be more accurate to delimit the potential source.
The results were reported in the journal Geophysical Research Letters.