We want your HALO 3 screenshots here. Add yours.
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I think I got it!
If you notice, those stars look different. Very different. The large stars (And only the large stars) are colored purple and orange, and some of them overlap. And you're right, they seem to bunch near the symbol. If this is Halo (Or any other sought-after planetoid/construct... Earth perhaps?) then, maybe, that is some kind of space battle.
Maybe?