(via Revealing the Universe: the Hubble Extreme Deep Field | Bad Astronomy | Discover Magazine)
Almost everything you see in that picture is a galaxy (you can tell foreground stars by the diffraction spikes). This is old news, I’m sure, to some of you, but the Hubble team started with the original Hubble Ultra Deep Field (which I blogged about last night) and started adding data, and adding data, and just adding more and more data. The overall combined data is about 23 days worth of continuous observation!
There are about 5500 galaxies in that image. The light from some of them has been travelling for 13 billion years, and are, in this image, only about 500 million years old.
Baby galaxies, folks. Baby galaxies.