New discoveries in the world of astronomy have had a major impact on our understanding of galaxies and the structure of the universe. One topic currently receiving great attention is the discovery of lost galaxies. In recent years, astronomers have used a variety of advanced techniques to identify previously undetected galaxies, surprising scientists with the number and variety of galaxies in the universe. Missing galaxies refer to large galactic structures that were not visible in previous observations. This could be caused by various factors, such as limitations in telescope technology and the influence of light from brighter galaxies. For example, the use of the Hubble Space Telescope and other observatories has succeeded in uncovering many galaxies in areas previously believed to be empty. One example of a lost galaxy is a small galaxy called UGC 477. Observations show that this galaxy consists of a smaller number of stars than the Milky Way galaxy, but has unique characteristics that make it interesting for further study. Deeper research reveals that UGC 477 may be a galaxy left over from an early era of galaxy formation. Data from circumgalactic surveys, such as the DESI (Dark Energy Spectroscopic Instrument) Survey, also helps in finding these galaxies. This survey not only looks for small galaxies, but also galaxies that have the potential to become dark halos, which can influence the large structure of space. Through spectroscopic techniques, astronomers can map the position, speed and composition of these galaxies. Another technique that also speeds up the discovery of lost galaxies is observations in a wider spectrum range, including radio waves and infrared. These waves can penetrate dust and gas that block light from more distant galaxies, allowing astronomers to discover galaxies that are invisible in visible light. For example, the ALMA (Atacama Large Millimeter/submillimeter Array) Telescope has provided extraordinary insights into discovering galaxies located at great distances. The discovery of this lost galaxy also provides new clues about galaxy evolution and interactions between galaxies. For example, studies show that these small galaxies are often involved in accretion processes where they merge with larger galaxies, so they often go undetected in normal observations. This explains why some galaxies appear brighter and larger than others. In addition, this discovery also changes our perspective on dark matter. The presence of the missing galaxies suggests that dark matter may be much more common in the universe than previously thought. By understanding the distribution of this dark matter, astronomers can construct more accurate models of the formation and evolution of large structures in the universe. As astronomical technology advances, the discovery of these lost galaxies will continue to be a major focus. This research is not only scientifically interesting, but also gives us deeper insight into the origins and evolution of the cosmos. With each galaxy discovered, we have the opportunity to enrich our understanding of this vast and complex universe.