jon ironmonger, bbc news. the most powerful telescope to ever be launched into space blasts off from french guiana tomorrow. it's travelling 1.5 million kilometres from earth, and it will look back in time to the first luminous glows after the big bang. 0ur science editor, rebecca morelle has more. it's taken 30 years to develop, cost more than $10 billion and has involved thousands of scientists. now the james webb space telescope is finally ready to launch to begin the most ambitious astronomy mission ever attempted. this telescope is absolutely the biggest and most complex and most powerful telescope that we've ever attempted to send to space. all of us astronomers are extremely eager to get this telescope into space. but i think it's going to work and i think it's going to, again, just completely revolutionise how we understand the cosmos. the telescope is a successor to hubble, which has given us amazing images. butjames webb is much more powerful. its mirror is almost three times bigger, which means it c