Casual Friday — do you think they do windows too?

The ESO (European Southern Observatory) Very Large Telescope (VLT) is an array of four giant telescopes — each with a primary mirror 8.2 meters in diameter. From time to time, these mirrors have to be cleaned and recoated in order to keep the images they produce clear and sharp — imagine the effort that goes into THAT task.

Well, actually, you *don’t* have to do much imagining — you can just watch this (10 minute) video that the folks at ESO put together for you:

H/T: Tom’s Astronomy Blog

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