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- Special Relativity

Hi, I'm taking an introduction course to Special Relativity and encountered a fairly simple problem:

Dirac travels to alfa centauri, which is 4.37 lightyears away. He stays there one Earth year and then travels back, and when he comes back he has aged 5 years. At what speed did he travel?

Fairly simple task, the answer is about ## v \approx 0.91c ##.

What are different quantities according to Special Relativity from Earth's perspective vs Dirac?

Time - The trip took longer according to us on Earth than Dirac.

The distance, 4.37 LY, according to us on earth. Does Dirac measure something else?

His speed, to us he traveled at 0.91c, what would Dirac say his speed was?

Dirac travels to alfa centauri, which is 4.37 lightyears away. He stays there one Earth year and then travels back, and when he comes back he has aged 5 years. At what speed did he travel?

Fairly simple task, the answer is about ## v \approx 0.91c ##.

What are different quantities according to Special Relativity from Earth's perspective vs Dirac?

Time - The trip took longer according to us on Earth than Dirac.

The distance, 4.37 LY, according to us on earth. Does Dirac measure something else?

His speed, to us he traveled at 0.91c, what would Dirac say his speed was?