M61 was a problem for Charles Messier from the start. He first encountered the spiral galaxy May 5, 1779, when he mistook it for a nearby comet whose path he had been ...
To the Editor: I am writing to urge that the United States provide Ukraine with the air defense weaponry it needs to stop further missile attacks on its military and civilian areas.
The luminous heart of the galaxy M61 dominates this image, framed by its winding spiral arms threaded with dark tendrils of dust. As well as the usual bright bands of stars, the spiral arms of M61 are ...
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