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2016-05-23 19:27 nesdori  
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I have always wondered what dark matter in the universe is but of course; it's dirt! :)

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2016-05-23 19:47 trischi83  
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only dirt! :)

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2016-05-23 19:55 krissz  
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And what is the dark energy?

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2016-05-23 21:27 trischi83  
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the force of the expansion :-() (not been researched) :-(