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Communications of the ACM

ACM Opinion

How We Proved Einstein Right on a Galactic Scale, and What It Means for Dark Energy and Dark Matter

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Gravitational lens ESO325-G004

The gravitational lens ESO325-G004. After subtracting the light of the galaxy, a blue Einstein ring becomes visible in the centre.

Credit: NASA/Hubble

Gravity may be the weakest of the fundamental forces in nature, but it is ultimately what enabled life on Earth to evolve.

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