Including advice on approaching alligators, and the now legendary 'how many moons?' debate. Original Air Date Thursday 18 September 2003, First aired on BBC Four Panel Host Stephen Fry Panellists Alan Davies Bill Bailey Rich Hall Jeremy Hardy Watch Clips QI | How Many Planets Were Thought To Be In The Solar System? 18 February: On this day in 1930, Pluto was discovered. From QI Series A, Episode 02 - 'Astronomy' With Bill Bailey, Rich Hall, Jeremy Hardy and Alan Davies For more visit http://qi.com Don’t forget to follow us on social media: http://facebook.com/OfficialQI http://twitter.com/qikipedia http://instagram.com/theqielves QI | What Man-Made Artefact Can Be Seen From The Moon?