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RE: To be dark matter or not to be dark matter - what does data tell us
I heard Neil deGrasse Tyson about dark matter that it is responsible for more than 80% of the gravity in the cosmos and that it is the longest unsolved problem in modern astrophysics. This is just awesome Sir!
I am not sure I would say it is the longest unsolved problem in the Universe (there are problems that are much older), but at least it is a problematics people are working on :)
Ahh I see, I only heard that from him though :)