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Guarana
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Homework Statement
For the development of life time is needed. The period during which the star remains at the main sequence depends primarily upon its mass. Type stars, our sun "yellow dwarf" remain on the main sequence about 10 billion years. Weight is often measured in multiples of the mass of the Sun called. M-Sun.
Life on Earth needed about 3.5 billion years to the local civilization could explore the universe, so if life anywhere else go to the same state, there must:
a) Weight of stars to be less than about 1.3 m-Sun.
b) Weight of stars to be less than about 3 m-Sun.
c) Weight stars to be less than about 13 m-Sun.
Homework Equations
The Attempt at a Solution
I don't understand why some of that has to be true...
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