True. It is currently believed that superclusters, which are large groupings of galaxies, lie on the surfaces of "bubbles" in space. These bubbles, also known as voids, are vast regions of space that contain very few galaxies or other cosmic structures. The distribution of these voids and superclusters creates a cosmic web-like structure, with filaments of galaxies connecting the superclusters and surrounding the voids. This web-like structure is thought to have formed due to the gravitational attraction of matter, with the denser regions of matter attracting more matter and forming the superclusters. The voids then formed in the regions where matter was less dense. This understanding of the distribution of matter in the universe has been supported by observations from telescopes such as the Sloan Digital Sky Survey, which has mapped the positions of millions of galaxies. The study of the large-scale structure of the universe is an important area of research in cosmology, helping us to better understand the origins and evolution of our universe.