It also raises the question of whether we know enough about the law of gravityThat's quite an understatement. Compare our ability to explain and manipulate light with our ability to explain gravity and our non-ability to manipulate it. We are far from being "done" with physics.
Maybe it is just some Senator trying to force them to come back for an upkeep or refurbishment at one of their local constituent run businesses?
Yep. We don't even know enough to be dangerous yet.