One of the technicians was preparing to attach the spacecraft to a launch vehicle when an unplanned event happened. Originally scheduled to launch on 18 December, the spacecraft will not launch before 22 December . Again, the launch date of the $10bn (£7.5bn) James Webb telescope has been delayed. There was an incident during the final preparations to mount the telescope on the launch vehicle. As a result, the launch from the Guiana Space Centre in French Guiana - the ESA's base of operations - will now be delayed until 22 December at the earliest. It happened at the satellite preparation facility in Kourou, French Guiana. The operation was run by Arianespace. Webb's launch vehicle adapter was being prepared for connection by scientists. This is a system designed to connect the observatory with Ariane 5's upper stage. In contrast to Hubble's more traditional design, Webb's primary mirror measures 21 feet across, and the sunshade needed to keep it cool was designed t