http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?f3-associated-Lesson%3DOptical%20History Results for your query: f3-associated-Lesson=Optical History Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m100after/m100after.dc.xml This image was taken with Hubble's Wide Field and Planetary Camera 2, installed to correct Hubble's optics. The difference in clarity is dramatic and represents the realization of the anticipated quality of images from a space-based, optical telescope. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m100after/m100after.dc.xml Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m100before/m100before.dc.xml This image was taken before the optics was fixed and demonstrates that the optical error generates images that are not much better than images taken with ground-based telescopes and were much less clear than expected. The picture is from the Wide Field and Planetary Camera 1. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/m100before/m100before.dc.xml Thu, 01 Jan 1970 12:00:00 GMT