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we're here at the Jet Propulsion

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Laboratory in Pasadena California home

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of Mars rovers but it turns out the

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folks working here are doing a lot more

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than that and I just happen to have here

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dr. Mike wrestler he is a miri project

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scientist Mary project scientist a

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mouthful what do you do in that job so

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miri is an instrument that will fly on

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the James Webb Space Telescope and it's

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sensitive to infrared light rather than

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visible wavelengths so we can see the

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heat from astronomical sources rather

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than the visible light that you see when

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if you look through a telescope with

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your eyes you are in charge of the

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production of the detectors what exactly

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is a detector the detectors are the

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sensors so if you have a digital camera

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there's a little electronic chip in the

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heart of the camera and that's the

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sensor it's what gathers a light from

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the lenses and converts it into a

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picture that you can look at your

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computer later on so the instrument that

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we're working on does exactly the same

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thing let's take a look at it and I

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think we have to get into bunny suits is

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that right well smocks to keep things

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clean so let me get my hair done today

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we have a light source basically a very

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sophisticated little light bulb that's

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mounted in our test setup that's shining

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on the detector and the detector is

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collecting light in steps we can see

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that the detector is indeed very

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sensitive it responds very well to light

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by where it saturates we can tell how

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bright a star will be able to look at

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once once James Webb actually launches

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all the right spots are bright because

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there's no bad pixels no hot pixels you

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know everything's just as it should be

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the detectors go through environmental

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tests they're shaken and chilled to make

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sure they survive the rigors of space so

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now it's time to do a final inspection

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of the unit to make sure nothing's

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happened to it while we were doing the

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testing so we want to check it to make

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sure that nobody accidentally got a

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fingerprint on it we want to make sure

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there are no broken wires or other

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damage to the unit we want to make sure

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everything is just fine so we're really

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wrapping up and were able to say this

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module is fully qualified and ready to

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go the mid-infrared instrument or Miri

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has three detectors all of which have to

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be precisely aligned with each other to

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within half the width of a human hair