Which major space telescope experienced a serious product defect in its primary mirror that required a complex in-orbit repair mission?

In the realm of astronomical instruments, precision is paramount. The development of advanced telescopes represents one of the most demanding product engineering challenges in science. This poll tests your knowledge of a famous product development crisis that significantly impacted astronomical research and changed how high-precision optical instruments are manufactured and tested.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

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