As the game that was going to be called StarStrike nears completion, there's a list of things I always check through:
One of them is making sure I won't find myself in legal trouble or step on anyone's toes.
Unfortunately, it transpires that there is indeed an existing product called StarStrike, a supplement for the old Spacemaster RPG.
That's a little too close for comfort, which means finding a new title.
"Cosmic Strike" is not taken, from what I can tell, though it may sound too much like a spaceship game (though to be fair, so did StarStrike)
Other possibilities that have come to mind:
Frontier World Encounters
Unified Space Territory
Beyond the Perimeter
I'd prefer avoiding a title that is "xxx and yyy" (ala Dungeons and Dragons).