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is there dark matter on earth
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do we know what dark matter is
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is there dark matter on earth, dark matter on earth, how much dark matter is on earth, is dark matter present on earth, is dark matter matter, does dark matter really exist, do we know what dark matter is, is dark matter real, do scientists know what dark matter is, dark matter is considered to be, is dark matter proven, has dark matter been proven to exist, facts about dark matter, dark matter doesn't exist
