The content originally appeared on: CNN Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. (CNN)European Space Agency astronaut Matthias Maurer's first spacewalk was an eventful one, beginning and ending with helmet issues. Maurer and NASA astronaut Raja Chari began the spacewalk at 8:32 a.m. ET. At the beginning of the walk, Maurer experienced an issue involving the camera and light assembly on his helmet, which did not pose […]