With the help of NASA’s Parker Solar Probe, astronomers have made the first continuous, two-dimensional maps of the outer edge of the Sun’s atmosphere. At this boundary, which scientists call the Alfvén surface, solar material escapes from the Sun to become the solar wind, a million-mile-per-hour stream of particles that flows outward in all directions across the solar system, striking planets, […]
NASA’s Parker Solar Probe Helps Map Sun’s Outer Boundary











