Solar Dynamics Observatory/NASA
Just when the sun was looking especially lethargic, a violent eruption left behind a vast chasm of superheated gas on the solar surface. On September 29–30, a searing filament of charged particles blasted away from the sun at more than 3 million kilometers per hour. The event left behind a scar that marks where the filament escaped into space. NASA’s Solar Dynamics Observatory captured this image by combining two different wavelength views. Yellow highlights plasma moving along the sun’s magnetic fields, and red-orange helps highlight the sun’s plasma at 50,000° Celsius.