Which marketing strategy did Celestron use in the 1970s that revolutionized the consumer telescope market?

In the competitive world of astronomy retail, one company dramatically changed the consumer telescope market through an innovative marketing approach. This strategy not only democratized stargazing but created a whole new category of amateur astronomers. Test your knowledge of this pivotal moment in astronomy product history that transformed how people experience the night sky.

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The introduction of 'Star Parties' - free public viewing events that let consumers test telescopes before purchase
The 'Schmidt-Cassegrain' campaign, which marketed compact, portable telescopes to non-scientists as an accessible hobby product
The 'Cosmic Subscription' model where customers could upgrade their telescope components annually for a membership fee
The 'Celebrity Astronomer' endorsement program featuring famous scientists in television commercials