Trans-Neptunian region

area of the Solar System beyond the planetary orbits comprising small bodies

theoretical cloud of planetesimals at the far edge of the solar system

collection of bodies in the extreme Solar System, outside of the Kuiper belt

The heliosphere is the magnetosphere, astrosphere, and outermost atmospheric layer of the Sun. It takes the shape of a vast, tailed bubble-like region of space. In plasma physics terms, it 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 the Milky Way. As part of the interplanetary magnetic field, the heliosphere shields the Solar System from significant amounts o

location in the extreme Solar System