A major discovery has been made in the search for extraterrestrial life, and it’s sparked both excitement and concern among experts.
Astronomers from the University of Cambridge, led by Dr. Nikku Madhusudhan, have confirmed new findings about a distant planet called K2-18b, located 124 light-years away in the constellation Leo.
While the planet was first spotted in 2015 by NASA’s Kepler Space Telescope, new data collected by the James Webb Space Telescope (JWST) has revealed something extraordinary.
A Planet With Striking Biological Markers
K2-18b is 2.6 times larger than Earth and orbits a red dwarf star.
The planet is what scientists call a Hycean world—a type of exoplanet with the potential to support life due to its watery atmosphere and relatively mild temperatures.
According to JWST data, researchers are now 99.7% certain that signs of biological life are present.
This makes it the first known exoplanet in a habitable zone where water vapor has been found in the atmosphere—a key ingredient for life.
But that’s not all. The planet’s atmosphere was found to contain high levels of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS)—chemicals that on Earth are typically produced by microscopic ocean organisms known as phytoplankton.
While these compounds are present on Earth in minuscule amounts (about 1 part per billion), K2-18b’s atmosphere has 10 parts per million—a massive increase, suggesting a strong potential for life.
Why Some Scientists Are Worried
While the discovery is being called the “best ever signs of life” on another planet, not everyone sees it as good news. Some scientists are raising red flags about what might happen if we try to make contact.
British physicist and science writer Mark Buchanan believes that reaching out could bring catastrophic consequences. Speaking to MailOnline, he said:
“I personally think it would be a really bad idea to just blindly make contact, without first trying to learn more about the other civilisation.”
He compared the situation to historical encounters between civilizations on Earth, which often resulted in the extinction or enslavement of the weaker group. According to Buchanan, if the alien civilization is more advanced, there’s no guarantee they’d be peaceful.
Should We Communicate With Aliens?
There’s an ongoing debate in the scientific community about whether we should actively send messages to alien planets.
Some researchers believe it could lead to breakthroughs in technology, environmental management, and more.
Others, like Buchanan, argue that caution is key.
If messages were to be sent, scientists could use radio waves or light signals (similar to how we send emails or texts). Buchanan says light signals would be more effective because they travel faster.
That said, many experts think it’s more likely that life on K2-18b is microbial—simple organisms rather than an intelligent civilization.
“Even If We Send a Message, Don’t Expect a Reply Anytime Soon”
Professor Avi Loeb, a theoretical physicist at Harvard University, also weighed in. He said that instead of trying to communicate, we should focus on listening for any signs of alien technology.
Loeb added that even if we did send a signal today, it would take 124 years to reach the planet, and another 124 years to receive a response.
That means the earliest possible reply would be in the year 2273.
“I’m not that patient,” Loeb joked, suggesting that observing the planet is more practical than starting a 248-year-long conversation.
He also doubts that aliens would take us seriously.
“They might not even see us as a threat, or as particularly intelligent,” he said, referring to the current state of global geopolitics.