Is The Universe Anisotropic?

A map of 850 distant galaxy clusters hints that the Universe might not be uniform. Combining data from US, European and Japanese X-ray space telescopes, researchers have revealed galaxy clusters that were around 30% brighter or fainter than expected, suggesting that their distances had been poorly estimated. Taking these clusters as beacons of the rate of cosmic expansion, the findings would mean that one region is expanding slower than the rest of the Universe, and another is expanding faster.