I've been going through the cards and can't find any hints as to what is inside the traveler. Was it a ship of a really advanced race like the forerunners from halo? Or does it store the best specimens from the races it has tried to protect so far? Any other theories someone might have???
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Just watched a video on this. It's in the grimoire. Only the Ghosts know what it looks like on the inside. One central sun orbited by 5 or 7 other suns. It's a contained universe, another reality. With this knowledge, if you go see the Speaker, he has those orbs. Those are actually a view inside the Traveler.