Primary Structure:
* Aluminum: The main structure of the telescope is built from aluminum, chosen for its lightweight yet strong properties, making it ideal for launching into space.
Optical Components:
* Mirrors: The primary mirror is made of ultra-low expansion (ULE) glass, a type of glass with exceptionally low thermal expansion, ensuring the mirror maintains its shape even when exposed to extreme temperature fluctuations in space. The secondary mirror is also made of ULE glass.
* Lens: The telescope uses a combination of quartz and fused silica for its lenses, offering excellent optical clarity and resistance to radiation damage.
Other Materials:
* Titanium: Some structural components are made of titanium, chosen for its high strength and corrosion resistance.
* Carbon Fiber Reinforced Polymer (CFRP): Used in various components like the sunshield, for its light weight and high strength-to-weight ratio.
* Mylar: The sunshield, protecting the telescope from the sun's heat, is made of a highly reflective, multi-layered Mylar film.
* Gold: The secondary mirror has a thin coating of gold, as it reflects infrared light more efficiently than other materials.
Electronics and Instruments:
* Silicon: The telescope's complex electronics and instruments are built using silicon-based semiconductors.
* Other materials: Many specialized materials, such as ceramics and polymers, are used for specific functionalities in the instruments and sensors.
The selection of these materials was carefully considered to ensure the telescope's durability, performance, and longevity in space. The Hubble Space Telescope serves as a testament to the ingenuity and precision engineering that make space exploration possible.
