Which telescope product innovation first introduced the revolutionary 'segmented mirror' design that would later become standard in many large observatories?

The development of astronomical instruments has transformed our understanding of the cosmos. From ancient astrolabes to modern space telescopes, product innovation in astronomy has pushed the boundaries of human knowledge. This poll tests your knowledge about a significant product development milestone in modern astronomy that revolutionized how we observe the universe.

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Hubble Space Telescope (1990)
Keck Observatory (1993)
Very Large Telescope (1998)
Gemini Observatory (2000)