How big is your outer circle for prep? The sun is a tempestuous mistress - and her outbursts are becoming more and more violent as the weeks go on. NASA's Solar Dynamics Observatory spotted the summer's first 'X' solar flare on Friday - a huge outburst from the sun right at the top of the scale. This came on the back of 12 'M' flares in just six days, with a M6.1 flare knocking out radio signals across the planet on Thursday - hinting at the destruction the sun could reign on our technology if Earth takes a full blast across its blow. The sunspot group behind the flares - named as AR1515 - stretches across 118,681 miles (191,000km) of the sun's surface. Read more: The sun's solar flares keep on getting stronger - with latest hot spot the size of 15 Earths strung together | Mail Online Bigest EMP we'll ever see if a big flare hits.