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The more distant in space we look, the farther back we're looking in time. 

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And so we're designing the James Webb Space Telescope to see past the point where 

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Hubble could see and to see the very first stars and galaxies to light

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up after the Big Bang. The James Webb Space Telescope is designed as an

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infrared telescope because infrared is really where the key science questions

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will be answered. To see those very very distant galaxies

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the light from those galaxies has been red shifted. The expansion of the universe 

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stretches space-time, the light from the galaxies gets stretched

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as well. And so longer wavelengths of light are redder. 

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So at some point in the distant past the light from those galaxies

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has been shifted - red shifted – all the way out of the visible spectrum

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into the infrared part of the spectrum. So having an infrared telescope

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in space is one of the things that will allow us to see those very first galaxies.

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