The unknown energy?

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http://www.slate.com/articles/health_and_science/mysteries_of_the_universe/2014/02/what_is_dark_energy_vacuum_energy_braneworlds_string_theory_gravity_quantum.html

This article is about the popular, newer topic of dark energy. Some people think "dark" means literally dark in shade of hue, which makes sense since space is dark in the far corners. However, it is actually just a term to call the "unknown" due to our own failing capabilities at finding an explanation of what dark energy (and matter) is, just like the "Dark Ages" were a time where we have little information about events.

The "braneworlds" theories seem the most interesting to me. To view this plane and dimension as the observable "membrane" with at least one other dimension connected that could interfere with our observable world (the expansion of the galaxy for instance), though we cannot interact with that dimension by normal means.