The discovery of a new planet in our galaxy, the Milky Way, is an important milestone in astronomy and space exploration. With technology continuing to develop, scientists are now able to detect exoplanets located far outside our solar system. These planets are in the habitable zone, where the possibility of liquid water and life increases. One of the main methods of discovering new planets is transit observations. This method involves measuring the decrease in a star’s brightness as a planet passes in front of the star. Space telescopes, such as Kepler and TESS (Transiting Exoplanet Survey Satellite), have successfully identified thousands of exoplanets using this technique. With careful data analysis, researchers can estimate the planet’s diameter, mass and distance from its parent star. An example is the discovery of Kepler-186f, the first exoplanet identified in the habitable zone of a sun-like star. This planet is similar in size to Earth and is located about 500 light years from Earth. The results of this discovery provide new hope in the search for extraterrestrial life. Apart from that, the radial velocity method is also an effective technique for identifying new planets. This method measures changes in the color or spectrum of a star’s light due to the gravity of the planet that surrounds it. This technique has revealed the existence of several giant planets orbiting close to stars, such as HD 209458b known as “Osiris.” Upcoming space missions, such as the James Webb Space Telescope (JWST), are expected to expand our understanding of exoplanets. JWST is designed to observe planetary atmospheres in greater detail, allowing scientists to look for signs of life, such as oxygen and methane gas. The main challenge in discovering new planets is their great distance, as well as the limitations of current technology. However, advances in machine learning and big data analysis provide new hope in faster and more accurate planet detection. By utilizing advanced algorithms, researchers can analyze the data efficiently, identifying planet candidates that may have been missed previously. One interesting discovery is the TRAPPIST-1 system, which consists of seven rocky planets, three of which are in the habitable zone. This discovery suggests that there are many planets that might support life in our galaxy. Further research is expected to reveal more information about atmospheric conditions and the potential presence of water on these planets. Although the discovery of a new planet in our galaxy raises many questions, one thing is clear: we still have a lot to explore. Each discovery not only increases the number of known planets, but also enriches our insight into how planets form, interact, and the possibility of the existence of life beyond Earth. Human curiosity about the universe is the main driving force in this search, and each new discovery gives hope for future discoveries.