Dark matter: It's time to ditch it in favour of a new theory of gravity - The Week

We can model the motions of planets in the Solar System quite accurately using Newton's laws of physics. But in the early 1970s, scientists noticed that this didn't work for disc galaxies stars at their outer edges, far from the gravitational force of all the…

We can model the motions of planets in the Solar System quite accurately using Newton's laws of physics. But in the early 1970s, scientists noticed that this didn't work for disc galaxies stars at th… [+6430 chars]

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