(Solution) - a The distance to the North Star -(2025 Original AI-Free Solution)

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(a) The distance to the North Star, Polaris, is approximately 6.44 x 1018 m. If Polaris were to burn out today, in what year would we see it disappear?
(b) How long does it take for sunlight to reach the Earth?
(c) How long does it take for a microwave radar signal to travel from the Earth to the Moon and back?
(d) 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?
(e) How long does it take for light to reach you from a lightning stroke 10.0 km away?