The US space agency Nasa has unveiled a model of a space telescope that scientists say will be able to see to the farthest reaches of the universe.The James Webb Space Telescope (JWST) is intended to replace the ageing Hubble telescope.
It will be larger than its predecessor, sit farther from Earth and have a giant mirror to enable it to see more.
Officials said the JWST - named after a former Nasa administrator - was on course for launch in June 2013.
The full-scale model is being displayed outside the Smithsonian National Air and Space Museum in the US capital, Washington DC.
It was recently shown off in Seattle at the American Astronomical Society meeting.
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