There is a maximum limit for the mass of a star.
Why it is true
Stars with a mass greater than about 150 times the mass of the Sun would be unstable due to radiation pressure and would eventually fragment. This limit explains why much larger stars do not exist.
Source: NASA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.