The week gone by saw the world celebrate the 25 th birthday of the internet on 23 rd August. On this day in 1991 , the public gained access for the first time to the World Wide Web, which had been designed & deployed by computer scientist Tim Berners-Lee at CERN in Switzerland. But today’s GK Nugget is about something else. On 24 th Aug 2006 the International Astronomical Union clarified the definition of a “ planet ”. It said that a celestial body must meet the following criteria in order to qualify as a planet: 1) It must be round. 2) It must orbit the sun. 3) It must have “cleared the neighbourhood" of its orbit. This means that as a planet travels, its gravity sweeps and clears the space around it of other objects. Unfortunately, Pluto (which was discovered on Feb 18 th , 1930 ) doesn’t meet criteria #3 & therefore it was classified as a Dwarf Planet . For the common man, this was a shock, but amongst the circle of astronomers it wasn’t so surprisin