The discovery of new planets in distant galaxies has become a topic of interest to astronomers and science lovers. With advances in telescope technology and observation methods, scientists have succeeded in detecting a number of extragalactic planets, expanding our understanding of the structure and dynamics of the universe. One method that is widely used to discover new planets is the transit technique. This technique involves observing a decrease in light from a star as a planet passes in front of the star, which causes a reduction in luminosity that can be measured with high accuracy. In addition, other methods such as the radial velocity method, utilizing shifts in light frequencies due to planetary motion, have become important tools in the search for distant planets. Planets discovered are often within the habitable zone, meaning they have the potential to support life. The habitable zone is the area around a star where temperatures allow water to exist in liquid form, which is essential for life as we know it. Since the discovery of Kepler 22b, the first planet found to be in the habitable zone, interest in planets in other galaxies has increased exponentially. One of the latest discoveries is a planet called TOI-700d, located about 100 light years from Earth in the constellation Dorado. The planet orbits a small, cool star, TOI-700, and is located in the habitable zone. With a size almost similar to Earth, TOI-700d attracts the attention of scientists for further research into the atmosphere and the possibility of life. This discovery was made by the TESS (Transiting Exoplanet Survey Satellite) mission, which was launched by NASA to search for planets outside our solar system. The TESS mission aims to detect and analyze potential planets that are in the habitable zone. With more missions in the preparation stages, such as JWST (James Webb Space Telescope), scientists hope to observe the atmospheres of these planets and look for signs of molecules that could indicate the potential for life. The diversity of planet types discovered is also very interesting. Some planets are the size of gas giants, while others are close to the size of terrestrial planets like Earth. The discovery shows that our galaxy is rich in a variety of planets, with possibly varying atmospheric conditions. Astronomers also face challenges in confirming this discovery. Using appropriate observation methods and obtaining additional data is important to reduce the possibility of errors in discovery claims. Success in observing planets in distant galaxies demands collaboration across disciplines, including astronomy, physics, and technology. With each new discovery, we get closer to understanding whether we are alone in the universe. There is no limit to the discoveries that could change the way we view our position in the universe and the potential for life on other planets. Exploring the uncertainty and wonder that exists in space is something that will continue to inspire future generations.