The discovery of a new planet in a distant galaxy is one of the most exciting achievements in modern astronomy. With advances in telescope technology and observation instruments, scientists have succeeded in detecting planetary ecosystems that have the potential to support life. Many of these planets are located in the habitable zone, which is the area where temperatures allow the existence of liquid water. A commonly used method for finding new planets is the Transit Method, in which researchers observe the dip in light caused by a planet passing in front of a star. Another method that is gaining popularity is Radial Velocity, which measures changes in a star’s light spectrum due to the gravity of surrounding planets. One of the latest discoveries came from the TESS (Transiting Exoplanet Survey Satellite) space telescope, which scours the sky to identify new planets in real time. This search is not limited to Earth-like planets, but also gas giant planets that can provide insight into the formation of planetary systems. In discovering new planets, astronomers evaluate important factors such as size, temperature and atmospheric composition. Larger planets often lie outside the habitable zone, but can provide valuable data on planet formation and star system dynamics. However, the discovery of small, Earth-sized planets in the habitable zone is a major focal point, given their potential to support life. One interesting example is the discovery of the planet TOI-700 d, located about 100 light years from Earth in the constellation Dorado. The planet is almost the same size as Earth and is within the habitable zone, making it an ideal target for further research. The Hubble and James Webb telescopes will examine its atmosphere for signs of molecules that could indicate the presence of life. Invalidation of planet search results is also important, because many signals can come from other phenomena, such as full planets or stellar fluctuations. Therefore, a verification process using several techniques and telescopes is necessary to ensure that the discovery is valid. The existence of new planets in distant galaxies is not only of interest to scientists, but also to the general public who admire the beauty and mystery of the universe. Each discovery brings us one step closer to answering the big question of whether we are alone in the universe. With ongoing technological advances, the future of planetary discovery will likely bring even more amazing results and give us a deeper understanding of the cosmos. In this context, international collaboration in the field of astronomy is very important. Institutions such as NASA, ESA (European Space Agency), and a number of observatories around the world often collaborate to collect and share data. This allows scientists from various disciplines to continue research and ensures that discoveries can be studied thoroughly. The science community predicts that in the coming decades, more habitable planets will be discovered, providing new insights into the possibility of life beyond Earth and the complex structure of our galaxy. These discoveries have truly changed the way we view our place in the universe and encourage us to continue exploring.