Which groundbreaking digital marketing approach did Celestron use in 2019 to promote its EdgeHD telescope series that revolutionized customer engagement in astronomy retail?

The astronomy industry has seen remarkable innovations in telescope technology, with manufacturers employing various digital marketing strategies to reach enthusiasts and professionals alike. The marketing approaches have evolved dramatically since the early 2000s, with some campaigns achieving legendary status in the astronomy community. Test your knowledge about how major telescope brands have marketed their breakthrough products!

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Interactive star map app that showed real-time viewing capabilities of different telescope models on actual night sky conditions at the user's location
Virtual reality showroom allowing customers to test telescopes on simulated space environments before purchasing
Astronaut endorsement program featuring former ISS commanders demonstrating telescope capabilities in online masterclasses
Subscription-based model where customers received monthly celestial viewing guides customized to their specific telescope model and location