The Luyten 726-8 Binary System Is Approximately 9 Light-Years Away

The Luyten 726-8 binary system is approximately 9 light-years away. If we send a spacecraft to visit this system traveling at 90% of the speed of light, how long will a one- way trip take as measured from the Earth?

A) it's impossible to tell unless we know the spacecraft's method of propulsion
B) more than 10 years
C) 10 years
D) less than 10 years

Correct Answer:

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