Imran Badr, taken from San Jose, California Our nearest major galactic neighbor, the Andromeda Galaxy (M31), shows off its star-forming regions, glowing in hydrogen gas and tracing out its dense spiral arms. This image represents 400 hours of total exposure, including exposures in Hα, SII, and OIII filters of 215.6, 46.6, and 32.8 hours, respectively,Continue reading "Andromeda’s knotty arms"