how many years would it take a radio signal from the exoplanet wolf 359 to reach earth? Wolf is 7.9 light years from earth.

Radio waves move at the speed of light which is aproximately 300,000 km per second or 3.8*10^8 m/s

1 ly = 9.461*10^15 m

Then

7.9 light-years = 7.4*10^16 m

By, velocity = distance/ time

time = distance/time

t = 7.4*10^16/3.8*10^8

= 1.9473684*10^24 seconds

Converting seconds to years (1 year = 31536000 seconds)

1.9473684*10^24/ 31536000 years

=6.17096989 ×10^16 years

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