Using the XMM-Newton telescope, astronomers have discovered a vast 23 million light-year-wide tendril connecting galactic clusters and containing much of the universe's missing matter.

'The models were right!' Astronomers locate universe's 'missing' matter in the largest cosmic structures

Source: space
Source Link: https://www.space.com/astronomy/astronomers-turn-up-missing-matter-in-the-largest-structures-in-the-cosmos-the-models-were-right