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You have correctly calculated the angular size of Betelgeuse, and
demonstrated an understanding of the concepts of angular size and how it
relates to size and distance. You know what units astronomers use for
angular size (arcseconds) and for distance (parsecs), and you know some
benchmark values for objects in these units. Congratulations.
You are now ready to try and tackle the real problem, that is to find the
size of the central star in HT Cas, winning over Dr. Greenglow's respect
and hopefully a job in her
lab!
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