What happened to Mara Sov and the awoken?
What happened to Saladin and the Iron Temple?
What happened to all the Siva stuff?
What happened to the Cosmodrome, Moon, Mars, Venus and the dreadnought?
Who was the Stranger?
I did not expect answers this is just to track what was left unanswered. I don't expect them to be answered considering it is Bungie.
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Presumably the other areas from d1 are still there, just not under attack at the moment. You can see the dreadnought still floating during the final cinematic. The rest will be addressed when their time comes, I suppose. Not everything needs to be explained at once.