Snow cleaning of the world's largest telescope mirrors was an impressive sight. The optics technicians would climb into a huge telescopic boom lift and spray immense clouds of cold carbon dioxide snow and gas onto the ten meter diameter mirrors high above the floor indoors. It would cause some of the accumulated dirt to magically fall off, leaving it less dirty. Steven Magee
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Cleaning up the worlds largest telescope mirrors by spraying snow onto them is an impressive feat. It’s impressive because the optics technicians had to climb into this huge telescopic boom lift which is suspended by chains and install themselves into it using a ladder. Once there, they would spray the entire surface of the mirrors with clouds of carbon dioxide snow and gas. This process would cause the accumulated dirt within the mirrors to magically fall off leaving them less dirty.

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