"The Enigma of the Solar System's 'Wall of Fire'"

The region where the solar wind meets interstellar space, known as the heliopause, has been dubbed the "Wall of Fire" due to its remarkably high temperatures, measured by the Voyager spacecraft. Despite the dramatic name, the "wall" is actually a region of hot plasma with extremely low density, making it unlikely to affect spacecraft passing through. The high temperatures at the heliopause have been attributed to either plasma compression or magnetic reconnection, and the Voyager missions' findings have provided valuable insights into this boundary region of the Solar System.