Yes, aluminum is indeed used in space exploration. It is valued for its lightweight properties, which are crucial for reducing the mass of spacecraft and payloads. Additionally, aluminum has good thermal conductivity and can withstand extreme temperature variations, making it suitable for various components in spacecraft. It is also resistant to corrosion and has high reflectivity, which can be beneficial for heat management and communication systems. However, its low strength-to-weight ratio compared to some other materials like titanium or advanced composites means it is often used in combination with other materials or for specific applications where its properties are advantageous.