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Exercise 3 - Measuring the Distance to the Cat's Eye Nebula

We measure the angular expansion velocity of the Cat's Eye Nebula by careful investigation of two Hubble images taken in 1994 and 1997. With the help of tangential velocity measurements from an earlier scientific paper, it is possible to determine the distance to the nebula. We also derive the distance by looking at how much radial intensity profiles of prominent features in the two images have changed between 1994 and 1997.

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Exercise 3 PDF files