If astronauts could travel at v = 0.964 c, we on Earth would say it takes about four years to reach Alpha Centauri, 4.37 light-years away. The astronauts disagree. (Caution: Do not use four years as the time interval measured on Earth. That is only approximate.) (a) How much time passes on the astronauts' clocks? Your Response History: 1. Incorrect. Your answer: "12.94 years". Correct answer: "1.42 years". The data used on this submission: v = 0.951 c; may change your answer and resubmit: years (±0.02 years) (b) What is the distance to Alpha Centauri as measured by the astronauts? Your Response History: 1. Correct. Your answer: "1.35 light-years". The data used on this submission: v = 0.951 c; light-years (±0.02 light-years)

If astronauts could travel at v = 0.964 c, we on Earth would say it takes about four years to reach Alpha Centauri, 4.37 light-years away. The astronauts disagree. (Caution: Do not use four years as the time interval measured on Earth. That is only approximate.) (a) How much time passes on the astronauts' clocks? Your Response History: 1. Incorrect. Your answer: "12.94 years". Correct answer: "1.42 years". The data used on this submission: v = 0.951 c; may change your answer and resubmit: years (±0.02 years) (b) What is the distance to Alpha Centauri as measured by the astronauts? Your Response History: 1. Correct. Your answer: "1.35 light-years". The data used on this submission: v = 0.951 c; light-years (±0.02 light-years)