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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.