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SOLVED:4.2 Exercise: Interplanetary Travel Earth's closest neighbor star (Proxima Centauri) is 4.2 light years away; or 3.97. '10"6 meters: A futuristic space ship caries humans at 80% the speed of light (measured
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How far is a light-year? | Astronomy Essentials | EarthSky
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SOLVED:If astronauts could travel at v=0.95 c, we on Earth would say it takes (4.2 / 0.95)=4.4 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. (a) How much time
