Staff at the European Southern Observatory have a system to clean the La Silla Observatory's delicate mirrors without breaking them.

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Space The ISS just dodged part of a 20-year-old Chinese rocket The International Space Station (ISS) had to raise its orbit on Wednesday to reduce the risk of being struck by a piece of space junk.

In this photo, staff at La Silla work to clean the 11.8-foot telescope's primary mirror. As the mirror was made with fused silica, it takes a delicate process to restore it to a clean ...