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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Astronomers and physicists follow the trajectory of many other planets, stars and such in space. And they keep track of where those objects are over time.
So when they reverse the track of all these objects, they come to an approximate time when those objects were in 1 location and started expanding from that point .. it’s what they call ‘The Big Bang’.
Simplified : If you would draw a line … and put a dot every minute of where endpoint of that line is at that moment … you can calculate the opposite way to find the endpoint of the line at a certain time in the past.
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