Which psychological principle did Celestron use in their successful 2018 marketing campaign that increased telescope sales by 42% during the Mars opposition?

Astronomy companies need marketing strategies just like any other business. This poll explores how famous astronomy brands have marketed their telescopes and other equipment to enthusiasts and professionals alike. Test your knowledge about the intersection of astronomy product marketing and consumer psychology!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Scarcity effect - advertising limited edition Mars viewing telescopes that would 'sell out before the opposition ends'
Social proof - featuring testimonials from NASA astronomers claiming these were the telescopes they use at home
Anchoring bias - initially showing premium $3000 telescopes before revealing their more affordable $800 models
Loss aversion - emphasizing that customers would 'miss a once-in-15-years viewing opportunity' without their products