The Heliopause
The heliopause boundary is situated between an area called the heliosphere and interstellar space. The heliosphere is a massive type of bubble that encloses and emanates from the Sun. It’s created by solar winds generated from the hot star providing Earth with light.
Distinguishing
A method of distinguishing between interstellar and heliosphere space is by looking at the nature of the solar particles located in each area. The particles are tightly packed and cooler in interstellar space. This isn’t the case for particles in the heliosphere.