Let a star be much brighter than our sun but its mass is same as that of sun. If our earth has average life span of a man as 70 years. In the earth like planet of this star system having double the distance from our star find the average life span of a man on this planet in terms of year there. (Assuming same average life).
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≈ 25 years.
Sol. The mass of the sun is same for both the cases, so we can apply
= 
= 
T planet = 2 3/2 years
The life span of the man is 70 years. During 70 years, the revolution completed by that planet = 
≈
25 revolutions. So, he will see 25 summers, 25 winters, 25 springs ... so according to that planet his age
will be 25 years.
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