Super Invar 32-5… How Matching Glass and Metal Thermal Expansion Rates Is Critical to the Performance of the World’s Largest Telescope Controlled Expansion AlloysBy JeffMay 10, 2021 The Subaru telescope’s active primary mirror support system employs 261 actuators and high-precision load sensors with 261 specially designed Super Invar 32-5 Alloy sleeves imbedded in the glass disk at the top of each actuator. Japan’s Subaru telescope, located atop … Read the article