While Britain fretted about the high possibility of cloud cover ruining views of Wednesday's solar eclipse, many scientists travelled to the Bulgarian Black Sea coast to get a clear view of the event. A team from the Rutherford Appleton Laboratory set up equipment there to measure rapid oscillations in the sun's corona - the fiery atmosphere which is only visible during an eclipse - which could help explain why it is so much hotter than the star itself. Experts at the Moorfields Eye Hospital were hoping for dense clouds. They have been preparing for a stream of casualties who have permanently damaged their retinas by staring at the sun.