In another article at https://www.bbc.co.uk/future/article/20230302-the-giant-arcs-that-may-dwarf-everything-in-the-cosmos https://www.bbc.co.uk/future/article/

In another article at https://www.bbc.co.uk/future/article/20230302-the-giant-arcs-that-may-dwarf-everything-in-the-cosmos https://www.bbc.co.uk/future/article/20230302-the-giant-arcs... “According to Lopez's article, it is extremely unlikely (a probability of just 0.0003 per cent) that such a large structurei could have arisen by chance.” The particles to make up the structure had to come from somewhere, and the best models of gravitational movement would say that such a structure would have taken too long to form. The arc is 1/15th the radius of the known universe. Such a structure isn’t ruled out by the cosmological constant. It’s highly unlikely. The distinction here is “unlikely to form anywhere” versus “unlikely for us to be situated in a position we could see such an unusual formation”.