How does a space telescope work?

In November, after some 10 billion dollars and 25 years to create, the James Webb Space Telescope will be launched into space allowing us to look back at galaxies created more than 13 billion years ago. Can you imagine? How does that even work? Professor in the School of Earth and Space Exploration at Arizona State University Jim Bell joins William Shatner.

PODCAST: https://soundcloud.com/rttv/sets/i-don-t-understand-with-william-shatner