So, what if it isn't man made? What if it happens to be alien? That would be pretty freaking awesome. And I have to admit, I'm kind of leaning towards the alien origin because, with the computers astronomers have at their fingertips, they could just back track WT1190F's orbit and determine who and when it was shot into space.
They done the backtracking bit rather efficiently on other things, why not this? I mean, they've taken the moon's orbit and the earth's orbit and gone back billions of years to determine it was formed when another, smaller planet collided with the earth. If they can do that, surely they should be able to tell us who's responsible for this bit of junk.
What if WT1190F isn't actually completely hollow? WE don't know. It might be carrying something, an alien cargo, perhaps. For all we know this might be the prelude to an invasion. Who's to say it isn't? It might contain a zombie virus. Or maybe something worse, a plague that turns the whole world into Republicans.