Discovery Details
The James Webb Space Telescope observed K2-18b for over 50 hours, capturing detailed atmospheric spectra. Analysis revealed significant water vapor concentrations along with methane and carbon dioxide. The planet, about 2.6 times Earth's size, orbits a red dwarf star every 33 days.
Habitability Assessment
K2-18b receives similar stellar radiation to Earth despite being closer to its cooler star. Surface temperatures could allow liquid water existence. The presence of methane alongside water vapor suggests possible geological or biological processes, though researchers caution against premature conclusions.
Future Research Plans
NASA scheduled additional observation time for K2-18b in coming months. Scientists will search for dimethyl sulfide, a potential biosignature gas produced by marine plankton on Earth. The European Space Agency plans complementary observations with its upcoming ARIEL mission.