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I've been reading a lot trough different articles about dark-matter and dark-energy and how they could explain observations such as the acceleration of the expansion of the universe or the gravitational pull of galaxies.
But what I ask myself is why? Why were these objects introduced in the first place? Why did physicists jump to conclusion saying this was another kind of unknown matter (which seems to me as a giant leap), and what are the reasons that made them follow this lead? Couldn't we consider that matter "simply" has exotic properties at large scales, just like it has at microscopic scales, which seems more fitting to me.
Are their any leads or theories that try to explain these phenomena without introducing the concept of dark-matter/energy?