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by fznfire » Tue Oct 31, 2017 9:14 am
At Wesleyan (where we have the best Master's program in US in astronomy :p) this is frowned upon, or so my professor said. But again, if you have had some strong research background, you will definitely show a preference to one field or the other!
At Master's level, it is good idea to have a exploring spirit, because as undergraduate we will not be exposed to all of the lines of research out there. In fact Ph D programs wants their student to do some diverse projects so get a broader base for their future research.