During the product development of the Hubble Space Telescope, what major flaw was discovered after launch that required an innovative solution?

The Hubble Space Telescope represents one of the most significant product development achievements in astronomical research. From its initial concept to deployment and subsequent servicing missions, it showcases how complex scientific instruments evolve through research, testing, and innovation. Test your knowledge about the product development journey of this revolutionary observatory that has transformed our understanding of the cosmos.

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The primary mirror had a spherical aberration due to manufacturing error
The solar panels failed to deploy properly, requiring a complete redesign
The onboard computers used incompatible software architecture
The telescope's gyroscopes were too sensitive to cosmic radiation