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(a) The distance to a star is approximately 7.25 ✕ 1018 m. If this star were...

(a) The distance to a star is approximately 7.25 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.)

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