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[Music]

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the wide field instrument is the heart

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of the nancy grace roman space telescope

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it is what allows the roman space

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telescope to take pictures with the same

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detail as hubble but covering an area

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100 times larger despite this incredible

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power the basic design is the same as

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telescopes around the world

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light enters through roman's 2.4 meter

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aperture

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and is reflected and focused by the

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curved main mirror which is also the

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largest mirror in the telescope

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this light is reflected and focused once

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more by the secondary mirror

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more elements tighten the beam and strip

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it of stray light rays before it passes

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through the filter wheel

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this wheel has a variety of filters that

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allow different wavelengths of light to

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pass through

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it spins from one to another depending

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on what the researcher is looking for

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finally the focused and filtered light

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reaches the focal plane where it creates

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an image on the detectors

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these detectors use the photoelectric

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effect to convert photons into an

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electrical signal that is then decoded

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into an image

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in roman's case there are 18 detectors

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allowing it to create 300 million pixel

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images of large patches of the sky

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the large number of detectors and pixels

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gives roman its wide field of view

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the size of the mirror and the precision

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of its optics gives roman its fine

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imaging

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this combination of image size and

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detail has never been possible on a

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space-based telescope before and will

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make the nancy grace roman space