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The most successful scientific instrument ever launched into space, the Hubble Space Telescope, is about to be replaced. The James Webb Space Telescope blasts off from Kourou in French Guiana on Christmas Day. Bigger and better than the Hubble, Webb will see even further out into space and turbo-charge the hunt for earth-like planets closer to home.

Today's Justin Webb speaks to Dr Stephanie Milam from NASA who is the Deputy Project Scientist for Planetary Science on the new James Webb Space Telescope. Today's science editor Tom Feilden also sends a report on the legacy of the Hubble and the hopes for the new telescope.