Looking for dark matter in the galaxy collisions such as in Abell 2744, dubbed Pandora's Cluster.X-ray: NASA/CXC/ITA/INAF/J.Merten et al, Lensing: NASA/STScI; NAOJ/Subaru; ESO/VLT, Optical: NASA/STScI/R.DupkeWe can map it, weigh it and simulate it, yet we still have no idea what it is. But dark matter is coming into the spotlight as never before.
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