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
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Alpha centauri is not only the closest star system to us (it is actually a triple star system) but i...
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