Which major space telescope was famously redesigned and delayed after its main mirror was discovered to have been ground to the wrong specification before launch?

In the world of astronomy, the development of advanced telescopes represents one of the most competitive areas of scientific product development. Organizations and nations invest billions in creating instruments that can peer deeper into space with greater clarity than ever before. This poll tests your knowledge about a famous product development race that changed our understanding of the cosmos.

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Hubble Space Telescope
James Webb Space Telescope
Chandra X-ray Observatory
Spitzer Space Telescope