When it comes to planes, visual inspection if the least important part of “stealth”. If you’re relying on someone seeing the plane to let you know that there’s a bomber incoming, you’re already fucked.
Stealth planes use a wide variety of plane shapes, materials, and technologies to make the plane hard to detect via the various methods we use to detect planes at long range. For example, if you scatter or absorb so much of the incoming radar waves that the returning signal is sufficiently small, you’re functionally invisible to radar.
The full list of how this is accomplished is well outside the range of an ELI5, but basically, you just have to convince enemy detection systems that you’re not as big or as fast as you actually are.
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