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When a gravitational lens magnifies a background galaxy, why don't we see the object doing the lensing, as we would if looking through an optical lens? | Astronomy.com

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When a gravitational lens magnifies a background galaxy, why don't we see the object doing the lensing, as we would if looking through an optical lens?

FROM THE April 2005 ISSUE

When a gravitational lens magnifies a background galaxy, why don't we see the object doing the lensing, as we would if looking through an optical lens?

ROBERT HERTRICK, PITTSBURGH

Published: Friday, April 01, 2005

Gravitational lensing is one of the more beautiful and unusual phenomena physicists have predicted and astronomers have stumbled across. When the gravity of a foreground galaxy distorts and magnifies light from a background galaxy, the result is either a single Einstein ring or multiple images of the object.