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[Music]

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nasa missions like kepler and also tess

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the transiting exoplanet survey

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satellite have really revolutionized our

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understanding of exoplanet demographics

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they've told us some basic but also

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really important planetary properties

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like planets sizes how far away these

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planets are from their stars how common

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planets of different types are but we

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want to take the next step now and know

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more about these planets not just as you

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know distant point sources but as actual

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places comparable to the worlds of our

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solar system so james webb is going to

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help us to take that next step by

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actually characterizing the atmospheres

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of exoplanets it's going to be able to

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measure the composition of these

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atmospheres and we've already been able

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to do this a little bit for the largest

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you know jupiter-sized puffy exoplanets

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with large atmospheres but we haven't

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been able to do this for small planets

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about the size of earth and with thin

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atmospheres so we really need a powerful

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and capable mission like james webb to

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be able to make those really sensitive

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measurements to tell us what earth-sized

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exoplanets are truly like