Which major telescope manufacturer issued a massive recall in 2018 due to defective primary mirrors that were spontaneously developing hairline fractures?

In the world of astronomy, equipment quality can make or break scientific discovery. In 2018, one major telescope manufacturer faced a significant product recall that shook the astronomy community. This recall affected thousands of amateur and professional astronomers worldwide and led to important changes in optical manufacturing standards. Test your knowledge of this pivotal moment in modern astronomy equipment history!

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Celestron
Meade Instruments
Orion Telescopes & Binoculars
Sky-Watcher