Alright so I've noticed a few things about the game visually that haven't been brought to light and other guardians should know. So I'll start with the moons skybox. In reality if you landed on the moon and looked into the night sky you see thousands of stars which is how you see it in destiny. The reason I bring this up is because in destiny there is this essence know as the darkness surrounding our solar system. This should make it impossible to see distant stars in our galaxy (correct me if I'm wrong). So why can we?
Secondly I wanted to point out that the tower isn't the only one. At the tower spawn turn around and look either left or right and you will notice two more towers along the wall in the distance. So this raises some questions like is there more than one speaker or is our tower unique and is the only tower that houses the guardians?
Some food for thought.
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I never got the impression that a literal aura of darkness was surrounding our universe, but rather a figurative threat.