As an expert in the field of astronomy, I can tell you that the concept of the "smallest star in the world" is a bit misleading. Stars come in a wide range of sizes, but the smallest stars that are still considered to be true stars are red dwarfs. The smallest known red dwarf is EBLM J0555-57Ab, which is about the size of Jupiter, a planet in our solar system. It's important to note that there are even smaller celestial objects known as brown dwarfs, which are not massive enough to sustain the nuclear fusion that powers stars.

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List of the smallest stars by star typeTypeStar nameRadius Jupiter radii (Jupiter = 1)Red dwarfEBLM J0555-57Ab0.84Brown dwarfWhite dwarfA.C.+70��82470.00157316804Neutron starPSR J0348+0432 A1 more rowread more >>