With the proliferation of commercial LEO imaging satellites there's pretty much always one above you.
Synthetic aperture radar satellites work at night and under the clouds as well so if you're trying to hide an aircraft development program it's going to be rather difficult.
edit: Radar messes with SAR as well but the government hasn't even bothered to try to shield Area 51.
> With the proliferation of commercial LEO imaging satellites there's pretty much always one above you.
Try buying pictures of Area 51 from one of those commercial leos and let us all know how that conversation goes.
> Synthetic aperture radar satellites work at night and under the clouds as well so if you're trying to hide an aircraft development program it's going to be rather difficult.
We’re also actively tracking where their satellites are at any given point in time and move things when they aren’t overhead.
So to act as if an individual on the ground couldn’t get info the satellites cannot is just silly.