Very distant galaxy cluster confirmed

The structures and star populations of massive galaxies appear to change as they age, but much about how these galaxies formed and evolved remains mysterious. Many of the oldest and most massive galaxies reside in clusters, enormous structures where numerous galaxies are found concentrated together. Galaxy clusters in the early universe are thought to be key to understanding the lifecycles of old galaxies, but to date astronomers have located only a handful of these rare, distant structures.

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Excellent, superb.

Now we have a first direct guide to the evolution of galaxies as a function of mass and shape at a time of only 10% of the age of the universe. Any idea how they chose to point Hubble in that direction? Probably because Chandra was picking up X-rays from there. Lets hope they keep finding more clusters at that distance.