Many factors at play.
To avoid radar detection the shape is an almost flat triangle to reflect the best way possible while preserving flight controls. The paint of all visible surfaces are coated with a special coating to avoid any reflections / absorb radar signals
To avoid thermal cameras there are no elements on the outside that are heated, such as air (pitot) tubes are heated on the inside instead
It also doesn’t send out any signals, other than military satellite signals, but no ground system can detect that because it’s pointing directly at the satellite
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