Star 119,660 km
The smallest known star is 2MASS J05233822-1403022, observed 40 light years from Earth. It has a diameter of around 119,660 km (74,353 mi), around 0.086 times that of the Sun (top).
You could fit the smallest country into the smallest continent nearly 17.5 million times. But can the smallest cat that ever existed really have been four times smaller than the smallest police dog? And what is the smallest unit of length in the universe? GWR presents a whistlestop tour of relative size, from stellar to sub-atomic.