The discovery of Earth-like exoplanets continues to be one of the main focuses of astronomy and astrobiology. Exoplanets are planets that are outside our solar system. Since the discovery of the first exoplanet in 1992, more than 4,000 exoplanets have been identified. Among these exoplanets, a small number show characteristics similar to Earth, making them potential candidates for searching for life beyond our planet. One of the main criteria for determining the “similarity” of an exoplanet to Earth is its orbital position in the habitable zone. These zones are areas around stars where temperatures allow liquid water to exist—the key to life as we know it. For example, the exoplanet Proxima Centauri b is in the habitable zone of the closest star to Earth, Proxima Centauri. The transit method is one of the most commonly used ways to detect exoplanets. This method involves observing the dip in starlight when a planet passes in front of its star. With this technique, scientists can determine the size, mass and composition of the planet’s atmosphere. The data obtained helps in assessing whether the exoplanet has characteristics that support life. The planet Kepler-452b is another example of an exoplanet that is considered Earth-like. Discovered by NASA’s Kepler mission in 2015, the planet is located in the habitable zone of its star and has a size and mass almost equivalent to Earth. Further research using the Hubble and James Webb space telescopes is expected to provide deeper insight into the composition of Kepler-452b’s atmosphere. Exoplanet atmospheres are an important element in the study of Earth’s similarities. Research shows that an atmosphere rich in greenhouse gases such as carbon dioxide can create a greenhouse effect that supports comfortable temperatures. One interesting candidate is LHS 1140 b, located about 40 light years from Earth. The use of sophisticated telescopes can help determine the presence of atmospheric gases that could indicate the possibility of life. The search for Earth-like exoplanets is not only useful in the context of searching for life, but also in understanding the origins and evolution of planets. By studying the environments of other planets, scientists can develop better models of how the Earth formed and its climate and geological systems. From a technological perspective, advances in telescopes and observation techniques allow much deeper exploration. The James Webb space telescope launched in 2021 offers the capacity to observe the light spectrum of distant planets, revealing details of their atmospheres. This technology gives hope for finding important elements such as water, methane or oxygen, which could be an indication of the presence of life. The Maharani Space Telescope and other projects being planned could further deepen the search for exoplanets in the future. The new discovery of an Earth-like exoplanet not only provides much hope, but also challenges scientists and researchers in better understanding life and our existence in the cosmos. Researchers continue to develop new methods for detecting and analyzing exoplanets, making this era of space exploration even more exciting.
