A millonairess was told in 1995 that she had exactly 15 years to live. However if she travels away from the Earth at 0.8c and then returns at the same speed, the last New Year's day the doctors expect her to celebrate is ___________

A millonairess was told in 1995 that she had exactly 15 years to live. However if she travels away from the Earth at 0.8c and then returns at the same speed, the last New Year's day the doctors expect her to celebrate is ___________

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Question

A millonairess was told in 1995 that she had exactly 15 years to live. However if she travels away
from the Earth at 0.8c and then returns at the same speed, the last New Year's day the doctors expect
her to celebrate is ___________

This is about special relativity : time dilation, please include step by step so i could learn from it.

Definition Definition Theory that describes how space and time interact. The special theory of relativity is based on two postulates in Albert Einstein's first formulation: The laws of physics do not change in each inertial frame of reference. The speed of light in free space is constant.

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