The Coronal Mass Ejection (CME) resulting from the big X-class solar flare on 10 June 2014 as seen through the LASCO C2 instrument of the ESA/NASA Solar and Heliospheric Observatory (SOHO).
LASCO (Large Angle Spectrometric Coronagraph) is able to take images of the solar corona by blocking the light coming directly from the Sun with an occulter disk, creating an artificial eclipse within the instrument itself.
SOHO is a project of international collaboration between ESA and NASA to study the Sun from its deep core to the outer corona and the solar wind.
More about SOHO: http://soho.esac.esa.int/home.html