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.
If we were going by that they are bound to find Yuki considering they were able to find Nia. GL is all about screwing the rules / making all universal laws and other universe laws / probability / time / space (basically everything) their *****.
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XBL GT: Demon Ninja X2
"There comes a time in every man's or woman's life where they have to make **** up to cover their ass." - Hazama