A Wind From The Sun . ... Credit Copyright: UVCS , EIT , SOHO Consortium , ESA , NASA Explanation: A wind from the Sun blows through our Solar System . ... Streaming outward at 250-400 miles/second, electrons and ions boiling off the Sun's incredibly hot but tenuous corona account for the Solar Wind - now known to affect the Earth and other planets along with voyaging spacecraft . ... The dark areas, known as coronal holes, represent the regions where the highest speed Solar Wind originates. ...