The most perfectly spherical object ever observed by mankind is the electron. In a series of experiments led by physicist Jony Hudson at Imperial College London, electrons were anchored to a molecule of ytterbium fluoride and measured 25 million times with a laser beam. These data showed that the negatively charged subatomic particles are a perfect sphere to within one billionth of a billionth of a billionth of a centimeter. To illustrate this fantastic sphericity, the research team said that if one were to scale up an electron to the size of our solar system–about 12 billion kilometers wide–any deviation from its roundness would be smaller than the width of a human hair.
The researchers were disappointed at this outcome–they were hoping to find some irregularity in the shape of the electron to help explain why our universe has more matter than antimatter.