I'm a big fan of QI, so it was fun when Brian Cox was on it recently and the whole show was peppered with astronomy.
I was amused to find them mention the interesting paper by Duncan Forbes and Pavel Kroupa in which they consider what the definition of a galaxy is. Luckily someone posted the segment on You Tube:
Earlier this year when they posted the discussion on the arxiv, Duncan and Pavel opened it up for a vote - in good "citizen science" style. Of course this caught my "Galaxy Zoo" eye so I blogged about it last Feb (2011).
It's on my mind tonight as I prepare to talk about "What is a Galaxy?" tomorrow night as part of the Intech Science Centre Adult Only Evening.
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