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you

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the James Webb Space Telescope is made

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up of four instruments but only one of

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them is being built in the United States

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it's called near cam or near-infrared

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camera to find out more about near cam

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we have with us the principal

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investigator for near cam Marshall Ricci

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Marshall what exactly does NIR cam do

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NIR cam is both the science camera for

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short wavelengths for JWST meaning it

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should take beautiful pictures like

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we've come to expect from Hubble but

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it's also the facility wavefront sensor

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and is used to tell how to line up the

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telescope near cam is actually part of

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the telescope in making the telescope

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work right what kind of science do you

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expect from your cam oh that's a that's

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a question we could spend the next five

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hours on but what we're expecting is to

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find the first galaxies that formed

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after the Big Bang we hope to find and

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characterize planets around other stars

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more about how solar systems form all

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kinds of things we're standing above

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some sort of cleanroom Marcia can we get

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down there to get a closer look at

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what's going on I think that can be

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arranged in my team that's been building

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this and aligning it and calibrating it

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can lead you through what it does what

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we have here is the optical metrology

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assembly for the NIR cam instrument we

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place an air cam inside of the chamber

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the system of mirrors takes a small beam

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from a star and it expands it up and

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then it makes the beam coming into the

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near cam instrument the same size and

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shape as if it would be coming from JWST

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why do you have a chamber for NIR cam

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why not just have it connected out here

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we want to simulate the operational

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environment that the near cam instrument

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will be in it can see hot it can see

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cold it can see vacuum all those

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different conditions that it would go

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through in its normal life thanks a lot

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for showing us your assembly you're most

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welcome

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the testing at the optical metrology

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assembly made sure near Kim could not

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just see a star clearly but use its

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vision to do science and help align the

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telescope after that phase was completed

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near cam went through some vibration

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testing before ending up here at NASA's

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Goddard Space Flight Center

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this time it'll go through a number of

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checks but it won't go with a loan near

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cams joined by the other science

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instruments on the Webb telescope thanks