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you

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hi I'm astronaut Mario ronco and I've

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had the rare privilege few have had of

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seeing our home planet from space the

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earth is certainly a beautiful place and

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astronauts over the years have returned

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to Earth with breathtaking images of our

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home planet now for the first time the

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international space station provides the

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ability to take more than simple

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photographs of the earth with the window

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installed in the u.s. laboratory module

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destiny there is the capability of

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acquiring multispectral and

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hyperspectral data and high-resolution

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imagery this optical quality science

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window was meticulously calibrated prior

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to its installation in the Destiny

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module it has greater than ninety-five

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percent transmission across most of the

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visible spectrum and better than ninety

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percent in the near infrared bands the

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window will support sensors and

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instruments with apertures of up to 350

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millimeters in diameter making it the

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highest quality window that has ever

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flown on any manned spacecraft the

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window port is 20 inches in diameter and

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is actually composed of four panes of

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glass an exterior debris pain that

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protects the entire assembly from

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impacts with space debris while the

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external shutter is open to pressure

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paints that maintain cabin pressure and

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on its interior side a removable scratch

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paint the scratch pain protects the

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interior pressure pain from internal

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contamination and debris and has a

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built-in heater to prevent condensation

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from forming on the window while the

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scratch paint allows occasional access

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to the window for crew earth observation

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photography it is not of the same high

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optical quality as the other three panes

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and therefore must be removed and stowed

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for science operations the whole

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assembly is protected from the space

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supporting the science instruments that

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would be placed in Destiny's window is

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the window observational research

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facility or wharf for short the wharf is

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the rack that is installed over the

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window and not only provides the

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necessary access to the window itself

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but also the power data and cooling

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connections required for science

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struments to operate I'm here in the

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space station processing facility where

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the wharf rack is being prepared for

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launch the wharfs payload volume has

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approximately 27 cubic feet of available

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space about three feet on a side to

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accommodate instruments the entire

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surface is coated with a flat black

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non-reflective finish to reduce stray

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light within the payload volume the

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payload shelf located within the lower

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portion of the payload volume provides a

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stable platform on which to mount

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instruments the mounting surface is

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three feet by two feet and is configured

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with 165 threaded inserts on a 2-inch

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grid that require 1032 screws the

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platform provides a line-of-sight

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stability of approximately 19 micro

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radians depending upon the mass of the

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instrument for more demanding

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instruments a detailed analysis should

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be performed to determine whether an

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individual instrument will require

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additional stabilization on the sides of

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the payload volume is an array of

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standard ISSC tracks five rows on each

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side wall and all on which can be

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mounted any ancillary equipment needed

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to support payloads only items that do

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not require stability should be attached

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to the seat tracks there is also see

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track on each side of the front face of

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the wharf for the same purpose opposite

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the payload shelf is one of the

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connector panels that provide the power

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data video and cooling lines for

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installed instruments there are three

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available sets of payload connectors on

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this panel each set has a power outlet

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providing 28 volt DC power with

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selectable current that can be set at 5

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10 15 or 20 amps and an instrument data

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port providing Ethernet rs422 rs-232 and

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RS 170 or video connectivity to the

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payload land and the wharf laptop

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computer the wharf laptop computer will

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reside outside the payload volume on the

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front of the rack and is connected via

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the laptop connectors on the front

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connector panel the front connector

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panel contains two more sets of payload

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connectors with the same power and data

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availability is on the internal payload

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connector panel this panel also provides

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the connections for the wharf laptop

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computer including a 28 volt DC power

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outlet with selectable current an

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Ethernet connection

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an rs-232 data port for rack commanding

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and health and status and a two-way RS

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170 NTSC video port an instrument

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package may also be controlled operated

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and monitored locally by the crew via

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the use of the pass-through connectors a

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set of which is provided on both the

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front and payload volume connector

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panels these permit direct connectivity

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from an interior instrument to support

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equipment outside the payload volume

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when the hatch is installed there is an

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additional connection that can carry 120

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volt DC power from one of the many

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utility outlet panels in the Destiny

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module to the internal payload connector

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panel these are intended mainly for the

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crew to use for portable lighting and

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ventilation when they are installing and

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removing equipment the environment

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within the wharf payload volume is

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regulated by an internal environmental

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control system the heart of which is an

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air-water heat exchanger located beneath

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the payload shelf in the bottom section

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of the rack the avionics air assembly or

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triple a is the fan that provides the

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air circulation for the system the

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Triple A also provides air flow across

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the window through a long narrow vent

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known as the air knife to prevent

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condensation from forming on the window

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when the scratch pain is removed the air