Messier 61 is a spiral galaxy in the Virgo Cluster. The blue glow is the combined light of millions of high-mass, luminous stars, much brighter and hotter than the Sun. The pinkish-red blobs dotting the arms are gigantic gas clouds (nebulae) from which stars are born. The stars warm the gas, causing it glow red.
In other words, as I've said before, space can be pretty.
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