Department of Physics, University of Maryland, Fall 2005, Prof. T. Jacobson


Introduction to
Relativity, Gravitation and Cosmology





   notes (2004)



This Hubble Space Telescope image shows several blue,
loop-shaped objects that actually are multiple images of the
same galaxy. They have been duplicated by the gravitational
lens of the cluster of yellow, elliptical and spiral galaxies
near the photograph's center.