Unprotected From Space Weather

Unprotected From Space Weather

. The first untethered walk in space, on 7 February 1984, where there is no place to hide from inclement Sun-driven storms. Bruce McCandless II, a mission specialist, wears a 300-pound Manned Maneuvering Unit (MMU) with 24 nitrogen gas thrusters and a 35 mm camera. The MMU permits motion in space where the sensation of gravity has vanished, but it does not protect the astronaut from solar flares or coronal mass ejections. High-energy particles resulting from these explosions on the Sun could kill the astronaut. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University