Some
4 billion light-years away, galaxies of massive Abell S1063 cluster
near the center of this sharp Hubble Space Telescope snapshot. But the
fainter bluish arcs are magnified images of galaxies that lie far
beyond Abell S1063. About twice as distant, their otherwise undetected
light is magnified and distorted by the cluster's largely unseen
gravitational mass, approximately 100 trillion times the mass of the
Sun. Providing a tantalizing glimpse of galaxies in the early universe,
the effect is known as gravitational lensing. A consequence of warped
spacetime it was first predicted by Einstein a century ago.
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