The Perfect Sphere – Well Almost!

An image of one of the most accurate man-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyroscope for the Gravity Probe B experiment in 2005, and differs in shape from a perfect sphere by no more than 40 atoms of thickness. It is thought that only non-rotating neutron stars are smoother. But later it was announced on 1 July 2008 that Australian scientists had created even more perfect spheres, accurate to 0.3 nanometers, as part of an international hunt to find a new global standard kilogram.

Via Wikipedia

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