This link explains gravational lensing well.
http://www.youtube.com/watch?v=fqYsh...escopes&fr=sfp and another video clip on the hubble ultra deep field images explaining the size of the observable universe,
http://video.search.yahoo.com/video/...s&fr=yfp-t-501, gee I love the internet so you can find this stuff hope you all enjoy.
Matt