NASA discovers possible evidence of life on distant exoplanet K2-18 b

K2-18 b's unique characteristics include a mass approximately 8.6 times that of Earth and placement within its star's habitable zone, where temperatures permit the existence of liquid water. These attributes make it an intriguing candidate for further study, reported Space.com.

One of the most intriguing revelations from the JWST observations is the possible presence of dimethyl sulfide (DMS) in K2-18 b's atmosphere. On Earth, DMS is primarily produced as a by-product of life, often attributed to phytoplankton. While this discovery is intriguing, scientists exercise caution, acknowledging that further observations are required to confirm its presence at significant levels. While the planet hints at a water ocean and an atmosphere with carbon molecules, these conditions do not guarantee the presence of life. Moreover, the planet's size, similar to Neptune, raises concerns about its oceans being too hot to support life due to high-pressure ice within its interior.

The discovery of K2-18 b's potential habitability has been made possible by advancements in telescope technology, particularly the JWST. Its extended wavelength range and sensitivity allowed scientists to detect distinctive spectral features in the planet's atmosphere with just two transits, a feat that would have required numerous observations with the Hubble Space Telescope over several years, Dr. Madhusudhan added.