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[ The world’s "roundest ball" ]

We have seen many balls, but there is no absolute sphere in the world, only in a weightless environment is it possible to make a truly perfect sphere. But now scientists have made a breakthrough by creating the roundest sphere on earth! And this is a little sphere that took five years and cost ten million dollars to build. Why make such a ball?

The idea is to become the new metric for kilograms. The international Kilogram (KG) has been stored in Paris for 120 years, but according to authoritative tests, it is "mysteriously" 50 micrograms lighter than the original weight. Although it has no impact on our daily life, it is obviously not good for sophisticated scientific research. So scientists around the world created the silicon sphere in order to redefine a more accurate measurement of the kilogram.

The sphere is made of 1 kilogram of silicon-28 with a purity of 99.99%.The raw materials for light manufacturing have been worth over 10 million yuan.In order to obtain the highest purity silicon,the scientists used centrifuges.These high-purity silicon wafers were then transported to the German National Institute of Weights and Measures, and after 6 tests, the silicon was made into silicon crystals.Finally, they were shipped to Australia, where the best engineers and the best equipment took months to complete.

This sphere has a diameter of 93.75 mm and is considered the roundest object in the world.
It is so round that even if you enlarge the sphere to the size of the earth,
 

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