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The analysis determined a preferred axis of anisotropy in the northern hemisphere. This suggests that a part of the northern sky represents a part of the universe that is expanding outwards with a greater acceleration than elsewhere.
Planck also confirmed some oddities earlier noted by WMAP. The simplest models of inflation predict that fluctuations in the CMB should look the same all over the sky. But WMAP has found, and Planck confirmed, an asymmetry between opposite hemispheres of the sky, as well as a ‘cold spot’ that covers a large area. The asymmetry “defines a preferred direction in space, which is an extremely strange result,” says Efstathiou.
There is no proof of dark energy, it is hypothetical, and it was only invented to explain the data (which could not be denied).