The primary source is the sun, with disturbances coming from solar flares, coronal mass ejections and magnetic storms. Scientists from Nasa, the National Oceanic and Atmospheric Administration and the ...
AS11-40-5878 (20 July 1969) --- A close-up view of an astronaut's bootprint in the lunar soil, photographed with a 70mm lunar surface camera during the Apollo 11 extravehicular activity (EVA) on the ...