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We officially have glass on the telescope! 🤩

Last week, Rubin Observatory staff safely installed the 3.5-meter secondary mirror—the first glass to be installed on the telescope! 🥳

Until now, testing the telescope was done using steel "surrogate" masses. But finally, it's time to put the telescope together for real🤩

With the first glass installed, we're in the final stretch of construction and on track to #CaptureTheCosmos in 2025!

🔗: https://rubinobservatory.org/news/secondary-mirror-installed