A Wall of Galaxies Spanning Space
The Great Wall is a massive chain of galaxies stretching across 500 million light-years. It is one of the largest structures ever discovered in the observable universe.
While we often think of galaxies as lonely islands in the void, they actually gather into immense, wall-like patterns. This particular structure contains thousands of galaxies clumped together by gravity. It was discovered in 1989 while astronomers were mapping the distribution of galaxies in our cosmic neighborhood. Finding such a colossal formation completely changed our understanding of the large-scale layout of the universe.
Source: CfA2 Great Wall