"The account I'd heard was that an underwater civilization on Golarion tried to pull an asteroid down onto Golarion to destroy a surface civilization they were at war with, thinking they'd survive it. They miscalculated, and it would've destroyed life on the planet; the gods moved the moon to deflect it, and then sacrificed themselves to slow the fragments in their collision with the world. But 'something from outside the local universe' played no particular part in it except in the sense that all asteroids are from very far away. It was initiated by a Golarion civilization, deliberately.  

There are many other examples of things from very far away impacting Golarion, of course. Famously a starship landed in Numeria long ago and the gods put up a bubble around it; no one who enters is ever possible to communicate with or get information about again, including in an afterlife. And I've heard it claimed Baba Yaga is from another universe."

"The account I'd heard was that an underwater civilization on Golarion tried to pull an asteroid down onto Golarion to destroy a surface civilization they were at war with, thinking they'd survive it. They miscalculated, and it would've destroyed life on the planet; the gods moved the moon to deflect it, and then sacrificed themselves to slow the fragments in their collision with the world. But 'something from outside the local universe' played no particular part in it except in the sense that all asteroids are from very far away. It was initiated by a Golarion civilization, deliberately.  

There are many other examples of things from very far away impacting Golarion, of course. Famously something landed in Numeria long ago and the gods put up a bubble around it; no one who enters is ever possible to communicate with or get information about again, including in an afterlife. And I've heard it claimed Baba Yaga is from another universe."