and do things together. 0n the international level, too, there is the risk of avoiding dialogue, the risk that this complex crisis will lead to taking shortcuts. the biggest space telescope ever constructed has been launched into orbit. the james webb telescope is on board a european ariane rocket which took off from french guiana. it's the successor to the hubble telescope, and designed to beam back unprecedented images of the universe. it's the most powerful ever built and the developers hope it will reveal stars and galaxies from the birth of the universe as well as distant planets which could provide evidence of life beyond earth. 0ur science editor rebecca morelle reports. and we have engine start. and lift—off. the start of a blockbuster astronomy mission. james webb begins a voyage back