Ancient buried trees and medieval records of glowing red skies have revealed a powerful solar radiation storm that struck Earth more than 800 years ago. Credit: AI/ScienceDaily.com Powerful solar activity can create stunning auroras on Earth, but outside the protection of our planet's magnetic field, the Sun can become extremely dangerous. Violent eruptions such as solar flares and coronal mass ejections can blast high energy particles through space, creating serious risks for astronauts and