Oops the universe appears to contain something too big, in apparent violation of the Cosmological Principle that it should appear homogenous at this scale.

http://www.sciencedaily.com/releases/2013/01/130111092539.htm

I don't think standard cosmology has got the size far wrong but it has got the time wrong, in  Vorticitating Hypersphere Cosmology time appears 'Finite and Unbounded', and thus effectively unlimited, despite the temporal horizon, thus allowing such structures as the above to form.