1. How many times longer does a 1.5-M star fuse hydrogen in its core than does a 15-M star? 2. Why does a shock wave from a supernova produce relatively few high-mass O and B stars compared to the...

1. How many times longer does a 1.5-M star fuse hydrogen in its core than does a 15-M star?

2. Why does a shock wave from a supernova produce relatively few high-mass O and B stars compared to the number of low-mass A, F, G, K, and M stars produced?

3. How would you distinguish a newly formed protostar from a giant, given that they occupy the same location on the H-R diagram?