 The hydrogen fusion process is temperature @-@ sensitive , so a moderate increase in the core temperature will result in a significant increase in the fusion rate . As a result , the core temperature of main sequence stars only varies from 4 million kelvin for a small M @-@ class star to 40 million kelvin for a massive O @-@ class star . 
 The hydrogen fusion process <a href='drop_aux' title='1'><mark>is</mark></a>temperature @-@ sensitive , so a moderate increase in the core temperature will result in a significant increase in the fusion rate . As a result , the core temperature of main sequence stars only <a href='uninflect' title='2'><mark>varies</mark></a> from 4 million kelvin for a small M @-@ class star to 40 million kelvin for a massive O @-@ class star . 
The hydrogen fusion process temperature @-@ sensitive , soo a moderate increase in the core temperature will result in a significant increase in da fusion rate . As a result , the core temperature of main sequence stars only vary from 4 million kelvin fa a small M @-@ class star to 40 million kelvin for a massive O @-@ class star .