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Wait till 5k then close the door.

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The mirror on NASA's Stratospheric

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Observatory for Infrared Astronomy

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was cleaned recently in preparation for the

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first full cycle of science observations.

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Because of the sensitive exposed optics,

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the telescope cavity of the heavily modified 747

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is designed to serve as a cleanroom.

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However, contamination of the optics

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builds up over time.

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Thus, while the aircraft and its systems were upgraded

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at NASA's Dryden Aircraft Operations Facility

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in Palmdale California.

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Telescope technicians use water, a mild detergent

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and a small filtered blower to

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remove dust and other material

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that had adhered to the mirror's surface.

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This is in preparation for the next astronomy

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observation period

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known as Cycle 1,