The last quasar probably died out a billion years ago, for none lie within a billion light-yearsof us.

Name: The last quasar probably died out a billion years ago, for none lie within a billion light-yearsof us.
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The passage states that "The last quasar probably died out a billion years ago, for none lie within a billion light-years of us." This means that there are no quasars within a billion light-years of us, which is why the last quasar probably died out a billion years ago.

The Last Quasar Probably Died Out a Billion Years Ago