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Objects Encyclopedia Entry 1778565544

** An exoplanet discovered in 2019, known for its unique atmospheric composition and potential for hosting life. **CONTENT** ### Overview The exoplanet **Objects Encyclopedia Entry 1778565544**, designated as K2-18b, is a super-Earth located approximately 111 light-years from Earth in the constellation Leo. This fascinating celestial body has garnered significant attention from the scientific community due to its intriguing atmospheric properties and the possibility of hosting life. K2-18b is one of the many exoplanets discovered by NASA's Kepler space telescope, which has revolutionized our understanding of planetary formation and the search for life beyond our solar system. K2-18b is a terrestrial exoplanet, meaning it is a rocky world with a solid surface, unlike gas giants like Jupiter or Saturn. Its size is roughly 2.7 times that of Earth, making it a super-Earth. The exoplanet orbits its star, K2-18, a small, cool red dwarf star, in a relatively close distance, resulting in a surface temperature that could potentially support liquid water. ### History/Background The discovery of K2-18b dates back to 2015, when NASA's Kepler space telescope detected a transit signal, indicating that a planet was passing in front of its star. However, it wasn't until 2019 that astronomers confirmed the existence of the exoplanet using the Hubble Space Telescope and the Atacama Large Millimeter/submillimeter Array (ALMA). The subsequent analysis revealed that K2-18b's atmosphere is composed of water vapor, methane, and other gases, which is unusual for a terrestrial exoplanet. ### Key Information K2-18b's atmosphere is one of the most fascinating aspects of this exoplanet. The presence of water vapor and methane suggests that the planet's surface temperature is mild, potentially allowing for liquid water to exist. This, in turn, raises the possibility of life on K2-18b. The exoplanet's size and atmospheric composition also make it an interesting target for studying the formation and evolution of planetary systems. Other key facts about K2-18b include: * **Orbital Period:** 33 days * **Surface Temperature:** -10°C to 20°C (-14°F to 68°F) * **Atmospheric Composition:** Water vapor, methane, and other gases * **Size:** 2.7 times the size of Earth ### Significance The discovery of K2-18b and its unique atmospheric properties has significant implications for the search for life beyond our solar system. The presence of liquid water and a stable atmosphere increases the likelihood of life existing on this exoplanet. Furthermore, studying K2-18b can provide insights into the formation and evolution of planetary systems, which can inform our understanding of the origins of life on Earth. **INFOBOX** - **Name:** K2-18b - **Type:** Exoplanet - **Date:** 2019 (discovery) - **Location:** 111 light-years from Earth in the constellation Leo - **Known For:** Unique atmospheric composition and potential for hosting life **TAGS:** Exoplanet, Super-Earth, K2-18, Kepler Space Telescope, Hubble Space Telescope, ALMA, Atmospheric Composition, Liquid Water, Life Beyond Earth, Planetary Formation.