Question

question 10
1 pts
why is there an upper mass limit for main - sequence stars of about 100 to 150 solar masses?
objects above this mass do form in molecular clouds; however, they emit no light and are not
considered stars.
giant molecular clouds do not contain enough material.
objects above this mass fuse hydrogen too quickly & make too much radiation pressure and cannot
stay together.
the rotation rate is so high that such an object splits into a pair of stars.
general relativity does not allow such massive objects to exist.

Explanation:

For main - sequence stars, when the mass is above about 100 - 150 solar masses, the hydrogen fusion occurs at an extremely high rate. This rapid fusion generates an enormous amount of radiation pressure. The radiation pressure becomes so strong that it overcomes the gravitational force that holds the star together. As a result, the star cannot stay in one piece.
Giant molecular clouds do contain enough material in some cases. Objects above this mass do emit light (they are stars in the sense of nuclear fusion). Rotation rate is not the main limiting factor here, and general relativity does not prohibit such massive objects on the basis of the upper - mass limit for main - sequence stars.

Answer:

Objects above this mass fuse hydrogen too quickly & make too much radiation pressure and cannot stay together.