Which innovative marketing strategy did Celestron use in the 1970s that revolutionized how telescopes were sold to amateur astronomers?

In the competitive telescope market, one company's revolutionary marketing strategy changed how astronomy products were sold to consumers. This trivia question explores a pivotal moment in astronomy retail history that helped democratize stargazing and turn a specialized scientific instrument into a mainstream consumer product, creating an entirely new market segment in the process.

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Introduction of the 'Schmidt-Cassegrain' design that allowed for more compact, portable telescopes marketed as 'grab-and-go' astronomy
Celebrity endorsements featuring famous astronomers like Carl Sagan in nationwide television commercials
The industry's first subscription-based model where consumers could upgrade telescope components annually
Partnership with National Geographic to create co-branded telescopes sold exclusively through educational institutions