Sun Emits Fourth X-class Flare in a Week (image) NASA/Goddard Space Flight Center Caption The sun emitted a significant solar flare -- its fourth X-class flare since Oct. 23, 2013 -- peaking at 5:54 p.m. on Oct. 29, 2013. NASA's Solar Dynamics Observatory captured the flare in this image, which shows light in wavelengths of both 304 and193 Angstroms. Credit NASA/SDO Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.