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A compound lens forged by two galaxies is helping astronomers get a bead on the Hubble Constant and dark energy.
New observations suggest that the universe’s oldest galaxies are brighter than expected. Here's why this may be a big deal.
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First Known Double Gravitational Lens Is A Cosmic Telescope Into The Distant UniverseA major realization of Einstein’s general relativity is the fact that massive objects warp space-time in a way that is ...
Two massive galaxies are bending light from the same distant quasar, creating a so-called Einstein zigzag lens that could ...
Gravitational distortions produced by distant galaxies show a slight—but notable—disagreement with Einstein's predictions.
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