“an effect similar to that of looking through old window glass”

Montezuma's Raven

photo by T.R. Hummer

The sky is also dominated by the distorting effects of “weak lensing”, in which intervening matter bends light to subtly alter the shapes and orientations of more distant galaxies, creating an effect similar to that of looking through old window glass.

–Rachel Courtland, NewScientist

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