Last updated on April 17, 2014 at 12:39 EDT

IBEX: Observing the Sun’s Horizon

May 14, 2012

The Interstellar Boundary Explorer, or IBEX, is the first mission designed to map the entire region of the boundary of our Solar System. As charged particles from the Sun, called the “solar wind,” flow outward well beyond the orbits of the planets, they collide with the material between the stars, called the “interstellar medium” (ISM).  credit:  NASA