Which two major astronomy equipment companies merged in 2013 to create the largest telescope manufacturer and retailer in the world?

The astronomy equipment market has seen several significant corporate consolidations over the years, reshaping how amateur and professional astronomers purchase their gear. One particularly notable merger in the 2010s dramatically altered the landscape of telescope manufacturing and distribution. Test your knowledge about the business side of astronomy retail with this challenging question!

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Celestron and Meade Instruments
Orion Telescopes and Sky-Watcher
Celestron and Sky-Watcher (both under Synta Technology Corporation)
Meade Instruments and Explore Scientific