What is a significant feature of the F-35's design for stealth?

The design of the F-35 incorporates internal weapon storage as a significant feature for enhancing its stealth capabilities. By housing weapons in internal bays rather than on external hardpoints, the aircraft minimizes its radar cross-section and avoids disrupting its aerodynamic profile. This internal storage not only preserves the F-35's low observability but also contributes to a cleaner aerodynamic shape, reducing the potential for radar detection. In modern air combat, maintaining a low radar signature is crucial for evading enemy surveillance and targeting systems, allowing the F-35 to operate effectively in contested environments where stealth is paramount.

The other features listed, while advantageous for various operational aspects, do not specifically enhance the aircraft's stealth profile to the extent that internal weapon storage does. For instance, large wingspans improve maneuverability but can increase radar visibility; advanced materials may enhance overall performance rather than focus solely on stealth; and retractable landing gear aids in aerodynamics but does not directly influence stealth capabilities.