The US space agency reported that NASA's Voyager 2 spacecraft had crossed the boundary that marks the edge of the Sun's realm and the start of the interstellar space. By achieving this feat, Voyager 2 became the second human-made object to journey out of the Sun's influence after Voyager 1's solar exit in 2012. Voyager 2 has sent the most detailed look at the edge of the solar system.
Voyager 2's passage into the interstellar medium (ISM) was confirmed by the researchers at the University of Iowa in the US. They confirmed it by marking a definitive jump in plasma density detected by a plasma wave instrument on the spacecraft. The region of space outside the elusive boundary of the Sun's realm is produced by wind that streams outward from the Sun.
Voyager 2 spacecraft's leap:
The noted increase in plasma density is the evidence that Voyager 2 journeyed from the hot and lower-density plasma characteristic of the solar wind to the cool and higher-density plasma of interstellar space. The change that occurred after the spacecraft traveled beyond the heliosphere is similar to the plasma density jump experienced by Voyager 1 when it crossed into interstellar space.
The solar wind is referred to a stream of charged particles that are released from the upper atmosphere of the Sun which is the corona. The plasma consists of electrons, protons, and alpha particles.