High velocity as in coming in from the Oort cloud- Those would not be caught as NEO until they come in- and the first pass might be a collision. IMO a "standing watch" for such objects should be put in place.

As for Emdrive, the amazing thing is not how much thrust it produces, but that it DOES produce ANY thrust ( according to the recent articles in peer reviewed journals.

ANY analysis is only as good as the validity of the assumptions. IF ( and it IS a big if) it produces thrust that cannot be explained by errors, then it should be looked at even if it violates some "law"- after all, when analyzed as a fixed wing design, the bumblebee cannot fly. Perhaps there is something we are not aware of- quantum effects, tunneling, etc.

What we don't know we don't know.


" but in order to get an emdrive rocket to take off you would need to put out enough microwaves to cook every living thing for hundreds of miles around."

From what I presently see, this is correct. but if we want to launch
nanotechnology to another star, the total mass may be reasonable (drive plus payload)

I prefer the idea of a Bussard Ramjet (collect interstellar dust and heat it through a fusion reaction)- but the radiation problem is still there, for a living payload And it seems to work only with LARGE masses- the functional fusion units we have now are called "stars". Makes a nice idea for a trans-galactic trip, though.