1. About how long will a 0.4-solar-mass star spend on the main sequence? 2. If the stars at the…

1. About how long will a 0.4-solar-mass star spend on the main sequence? 2. If the stars at the turnoff point in a star cluster have masses of about 4 solar masses, how old is the cluster? 3. About how far apart are the stars in an open cluster? In a globular cluster? (Hints: What share of the cluster’s volume belongs to a single star? The volume of a sphere  

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