Alpha Centauri is not only the closest star system to us it is actually a triple star system) but it also seems to be an excellent place to look for extraterrestrial life. It is about 4.3 light years away from Earth. If an astronaut claims her journey there and back only took 6.3 years, then how fast was she traveling? Assume she made a fast turnaround once she arrived there!)
A) 0.68c
B) 0.73c
C) 0.86c
D) 0.81c
E) 0.54c

Question

Quizplus · Accepted Answer

The correct answer is A because the astronaut's speed can be calculated using the formula: speed = distance / time. In this case, the distance to Alpha Centauri is 4.3 light years, and the time taken for the journey there and back is 6.3 years. Therefore, the astronaut's speed is 4.3 light years / 6.3 years = 0.68c.

Alpha Centauri Is Not Only the Closest Star System to Us