Patrick Pester is a freelance writer and previously a staff writer at Live Science. His background is in wildlife conservation and he has worked with endangered species around the world. Patrick holds a master's degree in international journalism from Cardiff University in the U.K.
We've all wondered whether we're alone in the universe, and with potentially habitable planets, strange space signals and UFO hearings hitting the headlines, it's starting to feel like we're on the cusp of a major extraterrestrial discovery. But what's the best scientific evidence we've found for the existence of alien life?
Nikku Madhusudhan, a professor of astrophysics and exoplanetary science at the University of Cambridge, gave a similar response, saying,"I don't think we have clear evidence just yet of any kind for alien life." Researchers are looking inside and outside of our solar system for signs of life. Madhusudhan led a study, published in October 2023 in The Astrophysical Journal Letters, that detected hints of an ocean on a planet called K2-18 b, located more than 100 light-years away. Their data also suggested"potential signs" of dimethyl sulfide, a chemical that, as far as we know, is produced only by life on Earth.
Seager believes we'd confirm the existence of alien life only with sample-return missions — collecting samples from another planet or moon and bringing them back to Earth for study, in-situ measurements or"incredibly futuristic" technology, like a solar gravitational lens telescope, a theoretical instrument that would use the sun's gravity to magnify light from distant planets.
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