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The lowest-mass object to be detected at a cosmological distance using gravitational lensing: Astronomers have used gravitational lensing to detect the smallest dark object ever measured this way, a mass about 1 million times that of the Sun, situated some 10 billion light-years away
Perturbations to strongly lensed galaxy light in very long baseline interferometric imaging reveal a dark and unusually low-mass object at redshift z ≈ 0.9.
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