
Chuck,
Earth is an addition.
The verse you are referring to is:
The word in arabic is Al-Aafaaq.
Yusuf Ali has translated it as farthest regions. Pickthall as horizons. Khan/Hilali as universe.
Ibn Kathir wrote:
such as conquests and the advent of Islam over various regions and over all other religions.
So we understand that it would mean something like the "furthest frontiers".

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