Which product design innovation revolutionized amateur astronomy in the 1990s by eliminating the need for large, heavy telescope tubes?

The astronomy industry has evolved significantly in how products are designed and marketed to both amateur stargazers and professional astronomers. From telescope designs to astronomy apps, companies employ various strategies to appeal to space enthusiasts. This poll tests your knowledge about a fascinating product design innovation that revolutionized how we observe the night sky.

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The Dobsonian mount design
Computerized GoTo technology
The Schmidt-Cassegrain compact optical design
The Truss Tube open-frame telescope design