[Article] Cosmologists have recently produced a 3-D map of the fairly mysterious substance known as “Dark Matter,” which is probably a very exciting development if you know what the substance is. So what is Dark Matter?
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When you talk about bits of the universe, you tend to talk about mass. That’s the physical manifestation of the presence of the objects. If you want to use an imprecise analogy, you could talk about weight... but mass is more correct.Dark Matter has mass, and that is about all that is really known...
