The Science Museum's primary permanent exhibition consists of four floors of mainly interactive science exhibits, totaling 200 items, with each floor focusing on a different theme. There is also a live science show with science demonstrations several times per day. Like the rest of the museum, these demonstrations are in Japanese only and visitors may require prior scientific knowledge to enjoy them.
The two secondary exhibits, both available separately from the primary exhibit, are a planetarium, which has a dome with a radius of 26.5 meters, the fifth largest in the world, and an Omnimax theatre, which projects the images of the heavens. In July 2004, the planetarium reopened after a renovation displaying the entire night sky as a next-generation digital image.
The museum also houses a collection of scientific resources, including
* Japan's first planetarium (a Carl Zeiss II model)
* the Cockcroft-Walton accelerator
* resources related to Seimikyoku, Japan's first fully-fledged chemistry laboratory
* pre-war electrical measuring devices
Its collection of books and magazines for a general audience, largely on astronomy, is the most comprehensive in West Japan.
The science building is the place where Hideki Yukawa created his theory on mesons, for which he was awarded a Nobel prize. At the time this building was part of Osaka University. It was also the first place in Japan where cosmic waves were measured.
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