The discovery of a new exoplanet is one of the most exciting scientific achievements of the last decade. With increasingly advanced telescope technology and observation methods, astronomers have succeeded in finding exoplanets that offer the potential to support life. One promising exoplanet is TOI-700 d, located about 100 light years from Earth in the constellation Dorado. TOI-700 d is part of the TOI-700 star system which also has two other planets. This planet is located in the habitable zone, which is the area around the star where temperature conditions allow the existence of liquid water. Astronomers note that TOI-700 d is nearly the same size as Earth, making it an attractive candidate in the search for extraterrestrial life. One of the interesting features of TOI-700 d is its parent star, TOI-700, which is a K type, a cooler and smaller star compared to the Sun. This feature could result in lower radiation, which could create a more stable environment for the surrounding planets. Previous research suggests that planets with K-type stars may be more likely to support life. Observations using the TESS (Transiting Exoplanet Survey Satellite) Space Telescope enabled the discovery of TOI-700 d via the transit method, in which astronomers observe changes in a star’s brightness when a planet passes in front of it. This technique provides substantial data on the size and orbit of an exoplanet, as well as its composition, which is important in evaluating its likelihood of supporting life. Further studies of TOI-700 d’s atmosphere are underway to look for signs of the presence of water and other components necessary for life. The use of spectroscopy can help observe atmospheric traces that indicate biological activity, such as oxygen or methane gas. The results of this research are expected to provide new insights into the potential of exoplanets to support life. On the other hand, TOI-700 d is also the subject of great attention in the scientific community, as it creates hope for future scientific missions for further exploration. Missions like the recently launched James Webb Space Telescope promise enhanced observational capabilities that could answer deep questions about the habitability of these exoplanets. With the number of exoplanets continuing to increase, TOI-700 d is just one of thousands of candidates waiting to be researched. The success of this discovery reflects advances in astronomical technology and the hope of finding other Earth-like planets in our galaxy. Collective efforts by astronomers continue to map and understand various physical and chemical aspects in the search for habitable planets. Learning about TOI-700 d not only increases our understanding of exoplanets, but also broadens our perspective on our place in the universe. Further research in the field of astrobiology and planet formation will further enrich our knowledge and generate interest in exploring the boundaries of life beyond our planet.