After the Hubble Space Telescope's launch in 1990, what critical flaw was discovered that significantly impaired its imaging capabilities until the 1993 repair mission?

The Hubble Space Telescope represents one of astronomy's most significant product launches, revolutionizing our view of the cosmos. Despite its initial challenges, it became NASA's most successful space observatory. This poll tests your knowledge about this groundbreaking product's launch history and the dramatic early issues that nearly derailed its mission. Do you know what critical flaw was discovered shortly after deployment that required an unprecedented repair mission?

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Spherical aberration in the primary mirror
Solar panel deployment failure
Communication system malfunction
Faulty gyroscope stabilization system