Merging galaxies throw shade on alternative dark matter theory


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The cores of two merging galaxies and their spiral arms


Galaxies in the early universe were merging up to 10 times more than is predicted by theories of “modified Newtonian dynamics”, known as MOND. This rate of mergers is in line with theories that take into account dark matter, the invisible and as yet undetected stuff thought to make up about 85 per cent of all matter.

Christopher Conselice at the University of Manchester in the UK, and his colleagues analysed observations of half a million galaxies from the local …

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