We're in the backyard with Roy for Brady's first reallife "eyeballing" of a Messier object. M15 is a globular cluster of stars. But what is happening in its mysterious core? Messier object playlist: http://bit.ly/MessierObjects

This video features Dr Meghan Gray and Roy Gretton.

Our thanks to The Royal Society for help with historic images. And Michael Siniscalchi (http://www.helixgate.net/) for an additional image.

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Videos by Brady Haran

Additional video editing by Stephen Slaterr