What material consists of thousands of threads of carbon filaments woven together?

The material that consists of thousands of threads of carbon filaments woven together is carbon fiber. This composite material is renowned for its exceptional strength-to-weight ratio, making it ideal for a variety of aerospace applications where lightweight and durable materials are crucial. The structure of carbon fiber, with its tightly woven filaments, provides enhanced tensile strength and rigidity, which is essential in aerospace components that must withstand high levels of stress and strain.

In comparison, steel is a metal alloy that, while strong, is much heavier than carbon fiber and does not possess the same level of flexibility or specific strength. Fiberglass, although also a composite material made from glass fibers, lacks the same strength and rigidity as carbon fiber due to its different fiber composition and structure. Aluminum, while also a lightweight metal used in aerospace, does not offer the same mechanical properties as carbon fiber, particularly in terms of strength and fatigue resistance under extreme conditions. Thus, carbon fiber stands out as the correct answer due to its unique composition and properties tailored for high-performance applications in the aerospace industry.