Which retail strategy first made high-quality amateur astronomy equipment widely available to the general public in the 1970s?

The astronomy industry has seen remarkable innovations in product marketing and retail strategies over the decades. From telescopes to star-tracking apps, companies have employed various approaches to bring the cosmos closer to consumers. This trivia question focuses on a pivotal retail strategy that revolutionized how astronomy products reached everyday stargazers. Test your knowledge of how the stars became accessible to all!

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The introduction of mail-order astronomy catalogs with monthly payment plans
Celestron's 'Orange Tube' revolution that standardized production to reduce telescope costs
NASA's retail partnership program that licensed space technology to consumer brands
Department store astronomy sections with in-store experts and demonstrations