The suns closest stellar neighbor proxima centauri is about, Ask an Expert

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The Sun's closest stellar neighbor, Proxima Centauri, is about 4.3 light-years from Earth. The Apollo 11 astronauts left Earth's atmosphere and traveled to the Moon at a speed of about 40,000 kilometers per hour (7 miles per second) on the Saturn V booster, the most powerful rocket ever launched - before or since.

a. Assuming they kept that speed, how long would it have taken them to reach Proxima Centauri? (You may safely ignore the effects of relativity, which would slow the passage of time.)
b. Would it help to travel twice as fast? Five times as fast?
c. What do your answers imply about the feasibility of interstellar travel?

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