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comment by caio
caio  ·  4889 days ago  ·  link  ·    ·  parent  ·  post: Dark Matter and Chocolate Pie.
One of the challenges of modern physics is to find a way to unite all Four Forces of the Universe into one. It's was alredy shown that the first three -- electromagnetism, the weak force and the stronge force -- could be described as one. Gravity still remains to be included in that model. So, yes, maybe it's because our understanding is still muddy.

More on the four forces here. http://tinyurl.com/68rcv5v