Why Does Astronomers Use Light Years To Measure Distances In Space
The yet-to-be-observed first light from the oldest Population III stars not long after atoms first formed and the CMB ceased to be absorbed almost. The cosmic microwave background has a redshift of z 1089 corresponding to an age of approximately 379000 years after the Big Bang and a comoving distance of more than 46 billion light-years.
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Astronomers observed that light from distant objects in the universe is redshifted shift in the frequency of light towards red color which tells us that the objects are all receding away from us.
Why does astronomers use light years to measure distances in space. In the same way light also has a Doppler shift whereby its frequency is shifted depending on the motion of the emitting object.
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