An astronaut left Earth in a spaceship at a speed of 0.95c relative to an observer on Earth. The astronaut traveled to a star system 16.5 LY away. Neither the astronaut, nor the observer on Earth agreed how long trip took. Let Earth represent the rest frame What is proper length? Who has the proper length? Who has the proper time? what is the proper time? What is the difference between the passage of time recorded by someone on Earth versus someone on the spaceship. rest frame a. Who had proper length?

An astronaut left Earth in a spaceship at a speed of 0.95c relative to an observer on Earth. The astronaut traveled to a star system 16.5 LY away. Neither the astronaut, nor the observer on Earth agreed how long trip took. Let Earth represent the rest frame What is proper length? Who has the proper length? Who has the proper time? what is the proper time? What is the difference between the passage of time recorded by someone on Earth versus someone on the spaceship. rest frame a. Who had proper length?

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