Dr. Merav Opher talks about the heliopause, the distant region where the solar wind collides with the interstellar medium. She is an astrophysicist and an associate professor of physics and astronomy at George Mason University. These short videos were produced for the Sun-Earth Connection Education Forum and the Space Weather Media Viewer. The Space Weather Media Viewer is an application built to support Education and Public Outreach activities of NASA. Many of the images that appear in this viewer are "near-real time" and come from a variety of NASA Missions.