On February 17, 2007, NASA launched a quintet of satellites to figure out the science behind Earth's most colorful auroras. Discover more space history 👉 https://space-com.visitlink.me/bNIW_V The mission was titled THEMIS, which stands for Time History of Events and Macroscale Interactions during Substorms. Substorms happen when Earth's magnetosphere is disrupted by solar wind, or energetic particles flowing from the sun. This causes auroras to brighten and undulate in the sky. THEMIS helped sc