Wow, stunning aurora captured by NASA astronaut Jeff Williams (astro_jeffw) aboard the International Space Station (ISS). Auroras are a space weather phenomenon that occur when electrically-charged electrons and protons collide with neutral atoms in the upper atmosphere. The dancing lights of the aurora provide a spectacular show for those on the ground, but also capture the imaginations of scientists who study the aurora and the complex processes that create them. Credit: NASA #nasa #space #iss #spacestation #aurora #spaceweather #science