Your comment about the jet program reminded me of something I read once about the US military trying to conceal a top secret jet (I think it was the SR-71) from spy satellites. The thing I read said that the planes heated up the runway where they sat, which would show up on thermal images of the runways. Iirc, they would go out and heat the runways further to make it seem like there were more planes or to change the shape of the heat signature.
This is based entirely off of memory, and I can’t find the right search terms to look for more info, so take it with a grain of salt.
Your comment about the jet program reminded me of something I read once about the US military trying to conceal a top secret jet (I think it was the SR-71) from spy satellites. The thing I read said that the planes heated up the runway where they sat, which would show up on thermal images of the runways. Iirc, they would go out and heat the runways further to make it seem like there were more planes or to change the shape of the heat signature.
This is based entirely off of memory, and I can’t find the right search terms to look for more info, so take it with a grain of salt.