Dark matter is behaving unexpectedly in way that suggests there is a ‘missing ingredient’, scientists say

Dark matter is not behaving as we would expected it to, scientists have said.There is an unusual mismatch between our theoretical models of how dark matter should be spread across galaxy clusters, and the way it actually seems to be behaving in those clusters, the researchers said.The effect of the gravity distorts light as it travels through space, and that light can be seen and used to measure the otherwise invisible dark matter.