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Artist's conception of Haumea, a Jacobi-ellipsoid dwarf planet, with its two moons
Artist's conception of Haumea, a Jacobi-ellipsoid dwarf planet, with its two moons
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An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyrosc
An image of one of the most accurate human-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, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nm) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nm, as part of an international hunt to find a new global standard kilogram.
Deck of playing cards illustrating engineering instruments, England, 1702. King of spades: Spheres
Deck of playing cards illustrating engineering instruments, England, 1702. King of spades: Spheres