Which famous design flaw was discovered in the Hubble Space Telescope shortly after its 1990 launch that required a major redesign and repair mission?

The Hubble Space Telescope represents one of astronomy's most significant product designs, transforming how we observe the universe. Launched in 1990, this remarkable instrument has overcome initial flaws through innovative redesigns to become astronomy's most influential tool. This poll tests your knowledge about the product design challenges and solutions that made Hubble the extraordinary scientific instrument it is today.

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Spherical aberration in the primary mirror
Faulty solar panel deployment mechanism
Defective communication antenna
Malfunctioning gyroscope stabilization system