Messier 81, 82 Mosaic

Taken from DGRO Rancho Hidalgo  Animas, New Mexico
14.5" RCOS F8 Apogee U16M High Cooling. 

Luminance 510, Red 220, Green 180, Blue 240 for each of the 2 panels.

On the left, surrounded by blue spiral arms, is spiral galaxy M81. On the right, marked by red gas and dust clouds, is irregular galaxy M82. This stunning vista shows these two mammoth galaxies locked in gravitational combat, as they have been for the past billion years. The gravity from each galaxy dramatically affects the other during each hundred million-year pass. Last go-round, M82's gravity likely raised density waves rippling around M81, resulting in the richness of M81's spiral arms. But M81 left M82 with violent star forming regions and colliding gas clouds so energetic the galaxy glows in X-rays. In a few billion years only one galaxy will remain.