Explore the groundbreaking Parker Lecture delivered by L. A. Fisk at the 1999 AGU Spring Meeting, delving into the complexities of the heliosphere and its interactions with interstellar space. Gain insights into Fisk's significant contributions to solar physics, including boundary value problems, polar coronal holes, and supergranules. Discover the intricacies of wave heating, slow solar wind, and the heliosphere's role in modulating interstellar dust, neutral gas, and cosmic rays. Examine the various phenomena within the heliosphere and understand its crucial importance in shaping our understanding of the Sun's influence on the surrounding space environment. Despite potential imperfections due to the age of the original file, this 51-minute lecture offers valuable knowledge for those interested in solar physics and space science.