M81 and M82 from last night... 3 hour photo. A American-Canadian team determined the distance to M81 to be 12.9 million light-years ± 0.9 million light-years. So the light I recorded last night happened about 13 million years ago.
Explanation: 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.
blaise Chiefsplanet's biggest bigot since 2007
Last edited by Dave Lane; 02-01-2011 at 04:06 PM..