> "dark matter" does seem to stand apart from any other theory of physics

I don't know if dark matter is anything special, just they hadn't
found unaccounted-for mass yet, whether it be hard-to-detect
wandering planets or other non-radiating debris. Even objects in
the theorised Oort Cloud

http://en.wikipedia.org/wiki/Oort_cloud

which forms the outer limit of the Solar System, can't be seen directly

http://www.newscientist.com/article/dn13362-giant-ropes-of-dark-matter-foun=
d-in-new-sky-survey.html

New method 'confirms dark energy'

http://www.bbc.co.uk/news/science-environment-13462926=20

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