A major solar storm with the force of a billion megaton bombs could be set to hit the Earth, scientists warned yesterday. The storm is expected to be unleashed from a group of sunspots 20 times the size of Earth, with experts believing it is aimed at our planet. The area of spots - called Number 652 - could release a storm powerful enough to damage satellites and put power grids out of action. The Sun's last bout of intense storms occurred last autumn, when a string of ten major flares over two weeks knocked out satellites, damaged others, and...