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a) How long does it take for sunlight to reach Pluto?

b) How long does it take for light to reach you from a lightning stroke 9.5 km away?

c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back?

d) The distance to a star is about 7.10 1018 m. If this star were to burn out today, in how many years would we see it disappear?

e) How long does it take for a radio wave to travel once around the Earth in a great circle, close to the planet's surface?

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