Dr. Loeb, it is pleasing to me and many others to find a man of your training and profession open minded toward the possibility (or probability) of “alien”, ET presence in our environment. My concern is that you joined Kirkpatrick in the strange pronouncement you find no evidence of utilization of physics beyond our current understanding. This is an incredible opinion for you, of all people, to maintain. Acceleration to hypersonic speeds without breaking the sound barrier? And, so many other inexplicable maneuvers for which our current physics has no answer.
I suggest you open your mind just a little further, but I thank you for the work you are pursuing.