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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Samantha Baldwin, 42, and her sons Louis Madge, nine, and Dylan Madge, six, haven't been seen for two days.
A spokesman for the UK Coastguard said it was coordinating a search operation in the Caernarfon Bay area of North Wales.
Sue and Noel Radford have announced they're expecting another baby in September.