There’s a solar Coronal Mass Ejection travelling towards us at 2253km/s, the largest solar storm since 2005. It will hit Earth around 9am ET (1am AEDT), causing fluctuations on the power grid and disruptions to the Global Positioning System.
Until today, NASA was only able to directly view the Earth-facing side of the Sun. We could see solar storms as they happened, but not necessarily as they developed. Now, thanks to STEREO, we can see all sides simultaneously.
