Hubble Space Telescope mirror under construction in 1984. The primary mirror measured 2.4 m (8ft) in diameter and was constructed of ultra-low expansion silica glass and coated with a thin layer of aluminum to reflect visible light. Launch was set for 1986 but delayed until 1990 because of the loss of the shuttle Challenger in January of that year | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NASA / Science Source |
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