(a) The distance to the North Star, Polaris, is approximately 6.44 x 1018 m. If Polaris were to burn out...
(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?
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Question Posted: January 25, 2010 03:54:52