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Week 5: How to measure your exoplanet

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This is an image of the edge of the Earth, with moving arrows above it, each going in circular motions. There is a set of straight arrows coming from the top left corner, towards the Earth. This is labelled Starlight. There is also text above the arrows: moving pockets of air at different temperatures change the refractive index.

 5.2  Prevent the stars from twinkling