The farthest objects in our Universe discovered by modern astronomers are so distant that light ...

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The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features which have not yet been satisfactorily explained. What is the distance in \( \mathrm{km} \) of a quasar from which light takes \( 3.0 \) billion years to reach us?
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