Voyager 1 observes sudden changes in cosmic ray intensity



The Voyager 1 spacecraft, which was launched in 1977, has reached a new region of space near the edge of the heliosphere, the bubble of charged particles surrounding our solar system. At the edge of the heliosphere is the heliosheath, the region where the solar wind slows down as it hits incoming particles from the interstellar medium. As it traveled through the heliosheath, Voyager 1 recently encountered a dramatic, unprecedented change in the intensity of cosmic rays.