That great big blob in the centre is the giant ellipital galaxy ESO 325-G004, and contains as much as 100 billion stars. The galaxy is surrounded by hundreds of thousands of globular star clusters, each of which contains hundreds of thousands of stars. The galaxy is then surrounded by hundreds of other elliptical and spiral galaxies.
Bad Astronomer Phil Plait has a really great write up on the photograph to help you understand it better.
Original Source: Hubble News Release
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