The launch of the James Webb space telescope

With the launch of the James Webb Space Telescope scheduled for 22nd December, Professor Richard Ellis (UCL Physics & Astronomy) discusses the largest and most complex space observatory ever built and how it will work.

Read: BBC News, More: UCL News, Listen: BBC World Service Radio’s ‘Discovery’ (from 5 mins 25 secs), More: BBC Radio 4’s ‘Inside Science’ (from 7 mins 21 secs)