Gravitational lensing

MargeB | 18:15 Tue 31st May 2005 | Science

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Get a very big object and use it as a lens to see a faint very far away object. If you don't have any objects with a huge mass then use one that's already there. Gravity 'bends' space around it. The greater the gravitation, the greater the lensing. Hence, if you use a distant galaxy cluster you may be able to see more distant objects beyond it. http://antwrp.gsfc.nasa.gov/apod/ap040627.html
An example of gravitational lensing at work. This galaxy cluster has such a large total mass and distance that the light from much more distant galaxies has been focussed towards earth. The APOD explanation is probably better than mine.

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