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A comment on New class of galaxy has been discovered, made almost entirely of dark matter. Parent comment
Actually, almost the only thing that we know about dark mater is that gravity affect it.
(Actually, we only know that there is something that is making a gravitational pull of normal mater, and we call this mysterious thing "dark mater".)
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Actually, almost the only thing that we know about dark mater is that gravity affect it.
(Actually, we only know that there is something that is making a gravitational pull of normal mater, and we call this mysterious thing "dark mater".)