The star Alpha Centauri is 4.25 light years from us,so it takes its light 4.25 years to reach Earth.It is impossible,in principle,for any rocket from Earth ever to reach this star in less than 4.25 light years.

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Quizplus · Accepted Answer

This is because the speed of light is the fastest known speed in the universe, and nothing can travel faster than it. Therefore, it would take 4.25 years for any object or signal to travel from Alpha Centauri to Earth, and vice versa.

The Star Alpha Centauri Is 4