The skepticism and debate around the question of "are we alone in the universe" makes the field of astrobiology more cautious ...

Discovering extraterrestrial life has tantalized the public imagination as far back as Epicurean philosophers in Ancient Greece. Yet despite centuries of speculation, the search for alien ...

But so far, no solid evidence of life has ever been found beyond Earth. A paper published in April 2025 claimed to detect a signature of life in the atmosphere of the planet K2-18b.

Stories about the existence of aliens, and our chances of detecting them, tend to be positive. We are told that we might ...

If confirmed, it would be the first proof of extraterrestrial life and a major leap in man's understanding of the cosmos. A hycean world. Nemes Laszlo/science Photo Library/Getty Images.

This Is the 'Strongest Evidence Yet' of Extraterrestrial Life. The molecules thought to have been found on K2-18b are only produced by life here on Earth.

The search for extraterrestrial life has long gone back and forth between scientific curiosity, public fascination and outright scepticism. Recently, scientists claimed the “strongest evidence ...

Scientists say they’ve found evidence of alien life. The truth is more complicated. There’s doubt over the significance of the planetary find, writes Campbell Rider ...

But so far, no solid evidence of life has ever been found beyond the Earth. A paper published in April 2025 claimed to detect a signature of life in the atmosphere of the planet K2-18 b .

Short of an alien radio message, spectra of chemicals produced exclusively by living things—called biosignatures—may be the only evidence of life we can collect from planets light-years away.

K2-18b may be a promising candidate for identifying extraterrestrial life. But excitement about biosignatures such as DMS disguises deeper, theoretical problems that also need to be resolved.

Scientists claim to have found evidence of alien life. But 'biosignatures' might hide more than they reveal. Apr 23, 2025. Why Webb may never be able to find evidence of life on another world.