In a major first, scientists have detected water vapor and possibly even liquid water clouds that rain in the atmosphere of a strange exoplanet that lies in the habitable zone of its host star about 110 light-years from Earth.
A new study focuses on K2-18 b, an exoplanet discovered in 2015, orbits a red dwarf star close enough to receive about the same amount of radiation from its star as Earth does from our sun.
Previously, scientists have discovered gas giants that have water vapor in their atmospheres, but this is the least massive planet ever to have water vapor detected in its atmosphere. This new paper even goes so far as to suggest that the planet hosts clouds that rain liquid water.
This study, which has not yet been peer-reviewed
Because this study has found evidence for liquid water and hydrogen in this exoplanet’s atmosphere and it lies within the habitable zone, there is a possibility that this world is habitable.
Such studies have suggested that planets with hydrogen-rich atmospheres could host certain forms of life, Benneke said. However, K2-18 b’s large atmosphere is extremely thick and creates high-pressure conditions, which “likely prevents life as we know it from existing on the planet’s surface,” a news release reads.
So, while Benneke does not rule out the possibility that this exoplanet could, in theory, support some sort of life, there is “certainly not some animal crawling around on this planet,” Benneke said. This is especially true, given the fact that “there is nothing to crawl on,” because the planet doesn’t really have a surface, he added.
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