Oh. I guess if it can punch a hole in the fabric of space-time it can probably go outside. Provided that it can figure out that's where Yuki is. (And provided that Yuki would resort to that in a combat situation anyway.) Intelligence did not seem to be the GL crew's strong suit, from the 8-ish episodes I watched.
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You put your RESOLVE HAT back on, which conveniently is the same hat as your NORMAL HAT.
{Drakeryn}