07SEP2015 ck
Here you can see the roundest object in the universe. But what is it good for? Did you know that the world's roundest object helps solve the longest running problem in measurement - how to define the kilogram? A kilogram isn't what it used to be. Literally. The original name for it was the 'grave', proposed in 1793, but it fell victim to the French Revolution like its creator, Lavoisier. So begins the tale of the most unusual SI unit. The kilogram is the only base unit with a prefix in its name, and the only one still defined by a physical artifact, the international prototype kilogram or IPK. This method required creating the most perfect sphere on Earth. It is made out of a single crystal of silicon-28 atoms.
There is debate as to whether this is truly the roundest object ever created. The Gravity Probe-B rotors are also spherical with very low tolerances such that they may in fact be rounder.
It looks really awesome and I am asking myself if this also could be the object with the most corners on the smallest surface?
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