Question

Why was it necessary to define a new unit to measure distances in the universe? What is this unit? ​

Answer 1

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Measuring these distances in kilometres would mean dealing with very large numbers. Astronomers, therefore, use special units to measure distances in space. Instead of a kilometre, they use a unit called light year.

Answer 2

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Measuring these distances in kilometres would mean dealing with very large numbers. Astronomers, therefore, use special units to measure distances in space. Instead of a kilometre, they use a unit called light year.