This guide from Nasa explains what happens when the powerful magnetic fields in and around the sun reconnect, which could lead to a "solar superstorm".
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The 29-year-old PR manager, who had appeared on Come Dine With Me, was killed days before leaving for a two-month trip to the US.
The Square has won the top prize of Palme d'Or at the Cannes Film Festival.
A band of thunderstorms