Is life really possible on another planet? James Webb Space Telescope may have the answer

The James Webb Space Telescope (JWST), renowned as the most potent telescope ever deployed, is poised to embark on a pivotal observation mission in its quest for extraterrestrial life. As per The Times' report, the telescope will train its gaze on a distant planet orbiting a red dwarf star, known as K2-18b, located 124 light-years away.

K2-18b has captivated scientists due to its potential to sustain life, believed to be a world covered by oceans and about 2.6 times larger than Earth. The critical element of interest for scientists is dimethyl sulphide (DMS), a gas NASA states is "only produced by life," primarily by marine phytoplankton.

While the presence of DMS in K2-18b's atmosphere would be a groundbreaking discovery, Dr. Nikku Madhusudhan, the study's lead astrophysicist from Cambridge, urges caution against premature conclusions. Although preliminary data from JWST indicates a high probability (over 50%) of DMS presence, further analysis is essential. The telescope is scheduled for eight hours of observation this Friday, followed by extensive data processing before reaching a definitive conclusion.


Despite the lack of a known natural or chemical process for generating DMS in the absence of life, the sheer distance to K2-18b poses a significant technological challenge. At the speed of the Voyager spacecraft (38,000 mph), a probe would require a staggering 2.2 million years to reach the planet.

However, the JWST's capability to analyze a planet's atmosphere's chemical composition through spectral analysis of starlight passing through its clouds offers a fresh perspective on the potential for life beyond Earth. This mission could potentially answer the age-old question of whether life exists elsewhere in the universe.

The upcoming observations also aim to clarify the presence of methane and carbon dioxide in K2-18b's atmosphere, potentially resolving the "missing methane problem" that has baffled scientists for over a decade. While theoretical work on non-biological sources for these gases continues, definitive conclusions are expected within the next four to six months.