The dwarf planet Eris, discovered in the early 2000s, represents one of the largest known celestial bodies in the scattered disc region of the solar system. Its discovery was facilitated by advanced imaging techniques employed at the Samuel Oschin Telescope at Palomar Observatory, California. In 2005, astronomers successfully captured images of Eris, using a CCD camera to view its faint reflection of sunlight. This remarkable achievement allowed astronomers to document and verify the existence of this distant object, which was initially discovered through a series of observations starting in 2003. Eris, originally known as 2003 UB313, is one of the most massive known dwarf planets and is located approximately 96 astronomical units away from the Sun.The images taken by astronomers revealed not only Eris itself but also highlighted the challenges of observing distant celestial objects that are faint and far from the Sun's illumination. With a diameter of about 2,326 kilometers, Eris is larger than Pluto, sparking discussions within the astronomical community regarding the classification of celestial bodies within our solar system. The data collected went on to confirm Eris’s significant size and also its potential for further study of trans-Neptunian objects, which have become a focus of modern astrophysics. The confirmed imaging of Eris led to debates over the definition of 'planet' and 'dwarf planet,' ultimately influencing how celestial bodies are classified in the solar system. Eris’s icy surface and the potential for atmosphere raise intriguing questions about the conditions of other celestial bodies in the cold outer solar system. Observations of Eris continue to provide insights into the nature and characteristics of distant worlds and assist in understanding the formation of our solar system.