The transcript and downloadable versions of the lecture are available from the Gresham College website:http://www.gresham.ac.uk/lectures-and-events/comets-visitors-from-the-frozen-edge-of-the-solar-system

Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,500 lectures free to access or download from the website.
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