How can the universe be 13.7bln years old if time depends on your frame of reference? Could others “think” it’s older or younger?
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Imagine a inflating a balloon with pictures of galaxies drawn on the surface.
It is expanding equally in all directions. We measure that, which means that we can also calculate how fast those galaxies are all moving away from each other. We can reverse than math to see how long ago they were all very close together. We have done several version of this experiment and each time, it brings us back to the answer of 13.7N years ago.
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