Major X-ray sky survey could relieve crisis surrounding the universe’s ‘lumpiness’


A new analysis of how galaxy clusters evolved over the 13.8-billion-year history of the cosmos could help solve a long-standing tension surrounding the ‘lumpiness’ of our universe’s matter content. Down the line, it may also help scientists solve a host of other cosmic mysteries. 

The first data from the eROSITA all-sky survey of cosmic X-ray sources, which completed 4.5 full sky surveys in February of 2022, contained precision measurements of both the amount of total matter in the universe and the matter’s level of smoothness, or “homogeneity.”



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