4、The gravitational lens equations account for all the variables such as distance and density, and provide a better idea of when light left the background galaxy and how far it traveled.
1、A gravitational lens is formed when light is bent by a massive object.
3、One might say that the cluster has acted like a giant magnifying glass, or gravitational lens, in space - focusing, magnifying and distorting the images of the galaxy.
2、The astronomers found an "X-ray mass" only a tenth of the mass found using the gravitational lens method.
