Under the auspices of the International Astronomical Union and the Official IYA2009 Collection Curator, Science Museum in London, UK.
148 countries. Thousands of people. Events ranging from backyard observing to global projects. Posters, stamps, coins, calendars, T-shirts, badges, dedicated books and movies, etc. The participants of IYA2009 produced a huge amount of promotional and outreach material, much of it carrying the distinctive IYA2009 logo.