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The correct answer is becoming an astronomy researcher
For starters, it is the only appositive phrase. It is also non-essential because the sentence conveys full meaning even if it was removed.
The pharse "HIC IACET ARTHURUS, REX QUONDAM REXQUE FUTURUS" from <u>"</u><u><em>The once and future king by T.H White" </em></u> <u>means: "Here lies Arthur, king once, king to be".</u>
It was a tomb inscription which promised that even Author was dead, he was going to return one day.