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Dictionary

gravita'tional lens'

Astron.
a heavy, dense body, as a galaxy, that lies along our line of sight to a more distant object, as a quasar, and whose gravitational field refracts the light of that object, splitting it into multiple images as seen from the earth.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

gravitational field

gravitational mass

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