Just days after sending a flare our way in February 2011, sunspot group 1158 blew its top again, this time letting loose an X-class flare, three times more powerful than the first. Again, no damage was seen here on Earth, but this marked the first big flare of the solar cycle, and gave us a taste of things to come over the next couple of years of solar activity.
Credit: NASA/SDO
Original blog post
Credit: NASA/SDO
Original blog post
