Gravitational lens-one of the most strange phenomena of the Great Universe that astronomers have learned to use to the common good, studying far-distant galaxies by determining the mass of dark matter in clusters, and much more.
The story then this. Scientists have long interested in the wonderful “red galaxies” – is a type of galaxies, which, apparently without showing too much brightness, nevertheless have a huge mass – mass of several tens of the Milky Way.
But the picture is even more interesting thing. Blue mascot around the red galaxies – so-called Einstein ring, a manifestation of gravity, described by him in the General Theory of Relativity. So, this mascot – distorted beyond recognition, image distant galaxies! Red shift is a horseshoe – 2.4, that is, we can see it here at a time distant from the Big Bang to 3 billion years!