First-Ever ‘Einstein Zig-Zag’ Found in Space Could Help Solve the Universe’s Expansion Mystery
A compound lens forged by two galaxies is helping astronomers get a bead on the Hubble Constant and dark energy.
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First Known Double Gravitational Lens Is A Cosmic Telescope Into The Distant Universe
Not only that, but the second lens also magnifies the first – though not very bright, it can be seen in the images collected ...