Which famous astrophysicist's endorsement in 2014 led to a 200% increase in Celestron telescope sales and revolutionized how astronomy products were marketed to the general public?

In the competitive world of astronomy equipment, smart marketing strategies can make or break a brand. This trivia question focuses on how Celestron, one of the leading telescope manufacturers, revolutionized their retail strategy in the early 2010s with a famous endorsement that significantly boosted their market share and brought astronomy to mainstream audiences. Test your knowledge about this pivotal moment in astronomy product marketing!

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Neil deGrasse Tyson, following the reboot of 'Cosmos: A Spacetime Odyssey'
Brian Cox, after his BBC series 'Wonders of the Universe' gained international popularity
Michio Kaku, during the promotional tour for his book 'The Future of the Mind'
Carl Sagan's estate, in a posthumous endorsement timed with the 80th anniversary of his birth