🌌 K2-18 b: the planet that could harbor alien life

The night sky still hides many secrets. But every now and then, thanks to technology and human curiosity, one of these secrets seems to want to surface. Such is the case with planet K2-18 b, a world 124 light-years away from us in the constellation Leo, which is raising new hopes among scientists.

Recent observations by the James Webb Space Telescope have revealed the presence of rare and potentially significant molecules in the atmosphere of this exoplanet. Compounds that, at least on Earth, are produced exclusively by living organisms.

We are perhaps closer to answering the question that humanity has always asked: are we really alone in the universe?

🪐 K2-18 b: the hycean planet that intrigues scientists

K2-18 b is no ordinary planet. It is located about 124 light-years from Earth, in the constellation Leo, and has been classified as a hycean planet-a type of exotic world that combines two key features: vast oceans and ahydrogen-rich atmosphere.

It is about 2.6 times larger than Earth and orbits a red dwarf, a star smaller and cooler than our Sun. Despite its distance and seemingly hostile conditions, K2-18 b is in the so-called “habitable zone,” where temperatures would allow the presence of liquid water-a key element for life as we know it.

But what makes this planet so interesting is not just its location, but its atmospheric composition. It is there that the James Webb telescope made a surprising discovery….

🔬 The discovery: molecules that could indicate life

By analyzing the light passing through the atmosphere of K2-18 b, the James Webb Space Telescope detected the presence of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) -two chemical compounds that, on Earth, are produced exclusively by living organisms, particularly certain types of marine phytoplankton.

This detection has left scientists stunned. These are not just curious gases: their presence could be a sign of biological activity, or at least of processes similar to those we know on our planet.

In addition to DMS and DMDS, methane and carbon dioxide were also detected, two other compounds that may be associated with life under certain conditions. However, it is important to note that the discovery is not yet conclusive evidence: there are also abiotic (nonbiological) explanations for the formation of these molecules.