Last month, European regulators grounded thousands of Airbus jetliners, citing an unusual reason: solar radiation. The planes’ electronics, the manufacturer said, were vulnerable to the charged ...

One technique involves releasing particles of sulphur dioxide high up in the stratosphere. Another involves trying to brighten the clouds over the sea by spraying salt water off the back of ships.

Researchers are closer to unraveling a longstanding solar mystery surrounding the extreme thinness of the sun's tachocline ...