Except for the few stars in the foreground (which are bright and easily recognizable because only they have diffraction spikes), every speck of light in the composite photo is an individual galaxy, some of them as old as 13.2 billion years; the observable universe is estimated to contain more than 2 trillion galaxies.1 From the Hubble eXtreme Deep Field.
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Footnotes
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Hille, Karl, ed. (13 October 2016). “Hubble Reveals Observable Universe Contains 10 Times More Galaxies Than Previously Thought”. NASA. Retrieved 17 October 2016. ↩