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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