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Einstein's Cross under the gravitational microlens

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Spanish astrophysicists obtain precise measurements for an object orbiting a black hole five billion light-years away. This is like detecting the ridges of a one euro coin located 100,000 kilometers away.

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Unkown User, "Einstein's Cross under the gravitational microlens", MachPrinciple, December 21, 2015, https://machprinciple.com/post/Einstein-s-Cross-under-the-gravitational-microlens

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