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We have officially

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installed all the inner parts

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of NASA's Nancy Grace 
Roman Space Telescope.

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But inside this 
outer barrel assembly,

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it's a really tight fit

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and we had to install
each of the instruments

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in a really specific order.

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The first of the big steps

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was to use a special counter-weighting tool  

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to install the coronagraph
into the instrument carrier,

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and then the whole 
mirror assembly

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was lifted on top of the 
instrument carrier.

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Next, the Wide Field Instrument

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was then added to the instrument carrier 

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and mirror assembly combo.

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Finally, that whole 
science collecting unit

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was lifted onto 
the spacecraft bus,

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which drives and 
operates the telescope. 

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And that completes
all of the internal parts

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of the Nancy Grace
Roman  Space Telescope.