Astronomers recently discovered another interesting cluster of galaxies that appeared at a time when our universe was between 2 and 6 billion years old. It includes dwarf galaxies that are very difficult to observe due to their low luminosity. It was possible to see them using gravitational lensing, which often helps astronomers detect distant objects. Thanks to this effect, it was also recently possible to describe for the first time the internal structure of a galaxy located 11.7 billion light years from Earth.
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