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[Music]

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a coronagraph is a way to see distant

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planets hidden by the glare of the star

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they orbit

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the chronograph reduces the light coming

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directly from the star to separate it

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from the light reflected by the planet

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the nancy grace roman space telescope's

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coronagraph doesn't block the star's

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light with an opaque disc as a simple

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coronagraph might

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instead it uses a combination of discs

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with complex patterns and light blocking

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stops to create destructive interference

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with the star's light effectively making

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it disappear while allowing the light

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from planets to pass through

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a complicating factor is that the light

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picks up small distortions as it

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reflects off the telescope's series of

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mirrors

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and these distortions can reduce the

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effectiveness of the destructive

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interference

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collecting more light increases the

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image signal but the planets are still

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hidden under blobs of leftover distorted

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starlight

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to remove these blobs the coronagraph

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has special deformable mirrors that can

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change shape by using hundreds of tiny

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pistons this corrects distortions in the

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light beam

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as the mirrors deform the blobs of light

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slowly begin to disappear revealing

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brighter planets

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further adjustment brings fainter

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planets into view

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advanced software processes this data

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further improving the contrast and

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clarity of the image

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this processing makes objects more than

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a billion times fainter than the star

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visible

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as a result the roman space telescope

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will provide the first look at