What is the primary mechanism that carves out the heliosphere?

Answer

The constant barrage of solar wind particles pushing against the interstellar medium

The heliosphere is described as a massive bubble carved out by the Sun's outpouring of matter, where the primary sculptor is the constant pressure exerted by the solar wind against the surrounding interstellar medium.

What is the primary mechanism that carves out the heliosphere?
sunsolar windparticle