An astronaut who was 2 0 years old left to explore the galaxy in 1 9 8 0 , on a spaceship travelling at 2 5 x 1 0 8 m s After 4 0 years of travel, how old does he appear to be Please answer showing full steps with the formula

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An astronaut who was 2 0 years old left to explore the galaxy in 1 9 8 0 , on a spaceship travelling at 2

An astronaut who was

20

years old left to explore the galaxy in

1980,

on a spaceship travelling at

2.5

10^8

/

.

After

40

years of travel, how old does he appear to be

?

Please answer showing full steps with the formula

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