What critical product design flaw was discovered in the Hubble Space Telescope shortly after its 1990 launch that required a major repair mission?

The Hubble Space Telescope represents one of the most significant product design challenges in astronomical history. Launched in 1990, it initially faced a critical flaw that threatened its mission. This poll explores how NASA's approach to product design and problem-solving turned a potential failure into one of astronomy's greatest success stories. Test your knowledge about this remarkable case study in space-based product engineering and its impact on modern astronomical research.

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Spherical aberration in the primary mirror due to manufacturing error
Solar panel deployment mechanism failure reducing power generation
Communication system incompatibility with NASA's tracking network
Thermal control system malfunction causing sensor overheating