Which famous astronomy product was initially considered a failure due to a manufacturing flaw, but later became revolutionary when scientists turned this 'defect' into its greatest feature?

The astronomy industry has seen remarkable product development over centuries, transforming how we observe the cosmos. From ancient astrolabes to modern space telescopes, astronomical tools have evolved through rigorous research, innovation, and sometimes serendipitous discovery. This trivia question explores a pivotal moment in product development that revolutionized our understanding of deep space. Test your knowledge of how cutting-edge astronomy products come to market!

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The Hubble Space Telescope's mirror
The Arecibo radio telescope's dish design
The Very Large Array's antenna configuration
The James Webb Space Telescope's sunshield