Voyager spacecraft discover a protective particle shield at the solar system's edge

Voyager spacecraft detected a "firewall" of charged particles at the solar system's edge, deflecting cosmic rays and potentially aiding Earth's habitability. This boundary, where solar wind meets interstellar material, was crossed by Voyager 1 in 2012 and Voyager 2 in 2018, revealing a sharp transition in particle dominance. Voyager's measurements confirmed theoretical models, providing the first direct evidence of this protective shield, despite extreme temperatures due to particle sparsity.