The lecture will describe the nearly 200-year-long detective story of the search for planets in the outer reaches of the Solar System. It led first to the discovery of Neptune and Pluto and, recently, to Pluto's downgrading to a 'Dwarf Planet'. We already know of a second dwarf planet beyond Pluto; what others might there be?
All our lectures are available for free download from the Gresham College website, in video, audio or text formats: gresham.ac.uk
Gresham College professors and guest speakers have been giving free public lectures in central London since 1597. This tradition continues today and you can attend any of our lectures, or watch or listen to them on our website.