So, they ARE Hiding Aliens...

 ...albeit not the intelligent or even living variety. Turns out a 2014 meteorite that exploded over Papua New Guinea was not from around here.

We weren't able to confirm it because the U.S. Navy was keeping some of the needed data classified. But now we know.

And we're going to hunt for bits of it to see if we can get a sample of interstellar material. It's probably a stray bit of somebody else's Oort Cloud.

(And not alive. Although we've all seen that movie).