The closest star in our solar system otherwise known as the sun, has been very active this week. On Friday evening the sun erupted a powerful solar flare. A flare so big that it would take 15 Earths set side by side to match or over 118,000 miles long. Friday's solar flare is known as a X class flare, and is the most powerful so far this summer, however it's not the biggest this year. The biggest eruption happened in March and is the 5th X class flare in 2012. Watch the video.