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[Music]

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infrared is an important wavelength for

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astronomers because several reasons the

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expansion of the universe to see farther

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back looking through dust clouds and

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looking at cooler objects like planets

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we can see into dust clouds the way that

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infrared does it the longer wavelengths

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of light actually can go bending around

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the obstacles like dust grains

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so we see around the dust grains and

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able to see inside those opaque clouds

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to see what's happening like in the

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infrared is important also when we want

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to see the most distant galaxies

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they appear to be running away from us

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at immense speeds because of the

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expansion of the universe the light that

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we received from those distant galaxies

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had been stretched along with the

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expansion of the universe so that it is

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much longer wavelengths which means

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started off with visible light and

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that's now infrared

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so if you want to see those first

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galaxies you need an infrared telescope

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to pick up the light that started out as