Serious problems soon arose with Soyuz 1, however, particularly the failure of a solar panel to deploy, which caused the spacecraft's systems to become unstable. It was believed that the cosmonauts from Soyuz 2 could solve the Soyuz 1 solar panel problem via an EVA. However, the Soyuz 2 launch could not proceed due to thunderstorms at the launchpad which affected the booster's electrical system. The Soyuz 1 mission was then aborted and Komarov was able to re-enter the Earth's atmosphere. However both parachutes and the retro-rockets failed, and Komarov was killed on impact.