Unsolved physics problem?

Why do galaxies rotate at speeds inconsistent with their apparent mass? This is one of the unsolved physics theory which existing theories seem incapable of explaining some observed phenomenon or experimental result. Follow up:... show more Why do galaxies rotate at speeds inconsistent with their apparent mass?

This is one of the unsolved physics theory which existing theories seem incapable of explaining some observed phenomenon or experimental result.

Follow up:
http://www.thenakedscientists.com/forum/...

http://www.sfetcu.com/book/Unsolved-prob...
Update: Could we discuss a little about it.
Thanks.
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