In the debate between Space Aluminum and Solid Copper, Space Aluminum is generally considered the better choice for aerospace applications. This is primarily due to its combination of high strength-to-weight ratio, excellent corrosion resistance, and lower cost compared to solid copper.

Space Aluminum, specifically grades like 2024 and 7075, are widely used in aerospace due to their exceptional strength and lightweight properties. Aluminum alloys can withstand the extreme temperatures and pressures found in space environments, making them ideal for components like airframes, landing gear, and engine parts. For instance, the 7075 aluminum alloy has a tensile strength of up to 735 MPa, which is significantly higher than the 300 MPa tensile strength of solid copper. This high strength allows for the design of lighter structures, which is crucial for reducing the overall weight of spacecraft.

Additionally, aluminum's corrosion resistance is superior to that of copper. In the harsh conditions of space, where exposure to saltwater and other corrosive elements is minimal, aluminum's resistance to corrosion is a significant advantage. This is particularly important for long-duration missions where maintenance and repair are challenging.

Furthermore, the cost of aluminum is significantly lower than that of copper. Aluminum is abundant and relatively inexpensive, whereas copper is a more scarce and costly material. This cost-effectiveness makes aluminum a more practical choice for large-scale aerospace projects.

Data from the Aluminum Association (2019) supports these claims, stating that aluminum has a strength-to-weight ratio that is 2.5 times higher than that of copper. This means that an aluminum structure can be 40% lighter than an equivalent copper structure, which is a significant advantage in aerospace applications. Additionally, the U.S. Department of Defense has specified aluminum alloys for use in aerospace applications due to their superior performance characteristics.

In conclusion, Space Aluminum is the better choice over Solid Copper for aerospace applications due to its high strength-to-weight ratio, excellent corrosion resistance, and cost-effectiveness. These factors make it the preferred material for critical components in spacecraft and aerospace vehicles.