1. What is the lowest mass that a star can have on the main sequence? a. There is no lower limit, b XXXXXXXXXXM c. 0.08 M, d. 0.4 M e. 2.0 M 2. Why are low temperatures necessary for dense cores to...

1. What is the lowest mass that a star can have on the main sequence? a. There is no lower limit, b. 0.003 M c. 0.08 M, d. 0.4 M e. 2.0 M

2. Why are low temperatures necessary for dense cores to form and contract into protostars?

3. Why do thermonuclear reactions not occur on the surface of a main-sequence star?