CAPE CANAVERAL – Nasa’s new space telescope opened its huge, gold-plated, flower-shaped mirror, the final step in the observatory’s dramatic unfurling. The last portion of the 6.5-metre mirror swung into place at flight controllers’ command. It is more powerful than the Hubble Space Telescope. It will scan the cosmos for light streaming from the first stars and galaxies formed 13.7 billion years ago. Nasa has outfit Webb with the largest and most sensitive mirror ever launched – its “golden eye,” as scientists call it.