Adam is born on a space ship that is traveling at the speed 90% of the speed of light and headed towards Earth. Sarah is born on Earth.
Suppose from Sarah's reference frame, Adam is 10 light years away.
She'd calculate that in Adam's reference frame, he'd believe Sarah is about 3.162 light years away.
Suppose Adam is 3.162 light years away in his reference frame. He believes she is the one moving. He would do the same calculation to find that Sarah is about 1 light year away in her reference frame.
I'm a bit confused about this. Can someone clear this up?

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