"Two stars within our own Milky Way galaxy anchor the foreground of this cosmic snapshot. Beyond them lie the galaxies of the Hydra Cluster. In fact, while the spiky foreground stars are hundreds of light-years distant, the Hydra Cluster galaxies are over 100 million light-years away.
Three large galaxies near the cluster center, two yellow ellipticals (NGC 3311, NGC 3309) and one prominent blue spiral (NGC 3312), are the dominant galaxies, each about 150,000 light-years in diameter. An intriguing overlapping galaxy pair cataloged as NGC 3314 is just above and left of NGC 3312. Also known as Abell 1060, the Hydra galaxy cluster is one of three large galaxy clusters within 200 million light-years of the Milky Way. In the nearby universe, galaxies are gravitationally bound into clusters which themselves are loosely bound into superclusters that in turn are seen to align over even larger scales. At a distance of 100 million light-years this picture would be about 1.3 million light-years across. "
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Related, highest recommendation:
"How Many Galaxies Are In The Universe?"
"The deepest image ever taken, the Hubble Extreme Deep Field, revealed ~5,500 galaxies over an area that took up just 1/32,000,000th of the sky. But today, scientists estimate that there are more than ten times as many galaxies out there than Hubble, even at its limits, is capable of seeing. All told, there are some ~2 trillion galaxies within the observable Universe. Here's how we know."
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