Milky Way faces midlife crisis

By David Shiga WITH the bulk of its star-making behind it, our home galaxy seems to be in the throes of a midlife crisis. An impending merger with another galaxy will provide a brief flurry of activity but otherwise the Milky Way’s future looks decidedly lacklustre. Most galaxies fall into one of two camps: blue galaxies that form stars vigorously and are full of young blue stars, and red galaxies that produce stars sluggishly or not at all and are dominated by older red stars. Galaxies of intermediate colour, called “green valley” galaxies,
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