“The exosphere marks the region of space,” said Dan Reisenfeld, lead researcher on the 3D mapping at the edge of the Solar System and a space science researcher at Los Alamos National Laboratory in New Mexico, USA. space where the solar wind, or stream of charged particles emitted from the Sun, is deflected by interstellar radiation and flown through the empty space outside the Solar System. and the interstellar radiation then meet to form a boundary of the Solar System”.|According to the study, the inner layer of the exosphere is roughly spherical and is thought to extend around 90 astronomical units (AU) in all directions. 1AU is the average distance between the Earth and the Sun. The outer exosphere is much less symmetric. It extends in 2 directions, 1 extends 110AU while the opposite direction is at least 350AU.|”There’s a lot of charged particles (plasma) in the interstellar medium, and the inner heliosphere is an obstacle in the flow of plasma,” said study author Reisenfeld. Through a rock in the stream, when the water rushes to the front of the rock, the back will be very quiet.”|However, this boundary may not stay that way in the long term. The researchers note that there is a correlation between the strength of the solar wind and the number of sunspots.|”If the sunspots gradually disappear, the shape of the exosphere can also change dramatically,” said Dan Reisenfeld.|NASA is planning to launch a new mission called the Interstellar Mapping and Accelerator Probe in 2025 to learn more about the exosphere. If all goes to plan, IMAP will reveal more details about the interactions between the solar wind and cosmic radiation at the edge of the Solar System.