I cannot comprehend your most recent calculations because I am having a difficult time comprehending light years.
Here:
4.2 light years to nearest star
8,000 m/s= top speed of shuttle
1 light year= 9.4605284 × 10^15 meters
1 year= 31,556,926 seconds
(4.2 light years) X (9.4605284 × 10^15 meters/ 1 light years) X (1 second/ 8,000 meters) X ( 1 year/ 31,556,926 seconds) = ... This is weird. My calculator gave me the same number as your initial equation's answer (157391.0402426396 years)
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