BBC - The Sun
 

The Sun is a 1 million km wide ball of burning gas. So be prepared for the best firework show you have ever seen!
Solar flares - Variations in the Sun?s magnetic field cause huge jets or loops of stellar material to shoot out into space.
Solar wind - Solar flares can be accompanied by dense clouds of electrically charged particles, travelling at around 450km per second. When they reach Earth, they can affect communications satellites.


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