How do we know that the universe is about 14 billions year old? I am having a hard time understanding it, how we can measure (the age and size) of something that we are not able to grasp?
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It’s our best estimate to be clear.
We can clearly see the universe is expanding, thanks to red shift (Doppler effect) in the light from the furthest galaxies. We can also see how fast it is expanding. Knowing those things, it’s easy to rewind the clock to estimate how long since it started expanding.
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