Could K2-18b potentially host liquid oceans on its surface?

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K2-18b Presents a Possibility for Surface Liquid Oceans

The exoplanet K2-18b orbits within its star's habitable zone, a region where temperatures could allow for liquid water to exist on its surface. While the presence of oceans is not definitively confirmed, scientists consider it a real possibility. This planet is notable as the first known exoplanet to combine a rocky surface, an atmosphere containing water vapour, and Earth-like temperatures.
Habitable Zone Orbit

K2-18b is situated at a distance from its star that is neither too close nor too far, placing it within the "habitable zone." This orbital characteristic is crucial because it means conditions may be suitable for liquid water, a fundamental ingredient for life as we know it, to exist on the planet's surface.
Detection of Water Vapour

Analysis of starlight filtered through K2-18b's atmosphere, captured by the Hubble Space Telescope, revealed the distinct signature of water vapour. Computer modelling suggests that the concentration of water vapour could range between 0.1 and 50 percent, a variability that encompasses the range found in Earth's atmosphere. Evidence for hydrogen and helium was also found, with potential traces of nitrogen and methane.
A Promising Candidate Beyond Earth

Scientists have identified K2-18b as the most compelling candidate outside our solar system for the search for signs of life. While not an exact replica of Earth, its characteristics, including the presence of water vapour and its location in a habitable zone, bring humanity closer to understanding whether Earth is unique in its ability to support life. Future missions are expected to provide more detailed insights into exoplanet atmospheres.

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Could K2-18b potentially host liquid oceans on its surface?

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