The Burning Ice Landscapes of Neptune-Mass Exoplanet GJ 436 b
A Paradox in the Depths of Space GJ 436 b stands as one of the most enigmatic planetary bodies identified within the local stellar neighborhood. Orbiting a dim red dwarf star just 30 light-years away, this world challenges conventional understandings of planetary composition. With a mass roughly 22 times that of Earth and a radius comparable to Neptune , the planet occupies a transitional space in planetary classification, often described as a 'warm Neptune.' Its most defining characteristic is not its size or its star, but its extreme atmospheric chemistry and thermal profile. Atmospheric Composition and Thermal Dynamics The atmosphere of GJ 436 b is remarkably deficient in methane , a finding that baffled initial researchers. Standard chemical models predict that a planet of its temperature and composition should be rich in carbon-bearing molecules. However, the detected low levels of methane...