Scientist find strong evidence of alien life on faraway planet
A team at the University of Cambridge's Institute of Astronomy made the discovery while studying the atmosphere of K2-18 b, a planet orbiting a dwarf star in the constellation Leo, about 124 lightyears away. Their efforts uncovered the distinct molecular profiles of gases — dimethyl sulfide, or DMS, and dimethyl disulfide, or DMDS — that on Earth are generated by living organisms, suggesting the potential presence of microbial life, researchers said.
Astrophysicist Nikku Madhusudhan called his team's discovery 'astounding,' but he also emphasized that they still need more evidence to be sure. He told the BBC that scientists intend to confirm what they've found in the near future, hopefully within the next couple years.
'These are the first hints we are seeing of an alien world that is possibly inhabited,' he told reporters in a press briefing. 'This is a revolutionary moment.'
Scientists researching the same planet, which is smaller than Neptune but bigger than Earth, previously detected methane and carbon dioxide in the atmosphere. They also reported the presence of dimethyl sulfide, a sulfur-based molecule that can similarly be interpreted as an indicator of life.
'This is a transformational moment in the search for life beyond the solar system, where we have demonstrated that it is possible to detect biosignatures in potentially habitable planets with current facilities,' Madhusudhan said, per Reuters. 'We have entered the era of observational astrobiology,'
He added that similar searches for signs of life are also underway in our solar system, including on Mars and Venus.
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By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. Preserved in teeth The ability to obtain DNA from remains that are thousands of years old has revolutionized biology, revealing previously unknown human groups such as the Denisovans and rewriting the population history of humans and other animals. The oldest sequenced DNA comes from one-million-year-old mammoth bones and two-million-year-old Arctic sediments. Proteins — biological building blocks encoded by the genome — are hardier than DNA and can push researchers' abilities to use molecules to understand ancient species deeper into the past. How far is contentious. In 2007 and 2009, researchers described shards of protein from 68-million-year-old and 80-million-year-old dinosaur fossils, respectively, but many scientists doubt the claims. 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Using mass spectrometry — which detects the weight of a protein fragment, allowing its composition to be inferred — the researchers identified partial sequences from 7 enamel proteins, making up at least 251 amino acids in total. An evolutionary tree integrating these sequences with genome data from living rhinos and of their two Ice Age relatives revealed a surprise. The Epiaceratherium sample belonged to a branch of the rhino family tree that split off earlier than any other: between 41 million and 25 million years ago. Previous studies placed this group among modern rhinos. 'It really does change the way we have to think about the evolution of rhinos,' says Ryan Paterson, a biomolecular palaeontologist at the University of Copenhagen, who co-led the study. Next step, dinosaurs Proteins degrade in the heat. The rhino sample that Paterson and his colleagues analysed came from a polar desert where average temperatures are well below freezing, 'the perfect place' for protein preservation, he says. The Turkana Basin in Kenya could be considered one of the worst — and yet it is the source of fossils as old as 18 million years, from which a second team sequenced enamel proteins. Ground surface temperatures there can reach 70 °C, and climate records suggest Turkana Basin has been 'one of the hottest places in the world for a very long time,' says Daniel Green, an isotope geochemist at Harvard University in Cambridge, Massachusetts, who co-led the study. The Kenyan enamel-protein sequences — from extinct relatives of rhinos, elephants, hippos and other creatures — fit with classifications made by palaeontologists on the basis of the fossils' bone anatomy. But Green hopes that future studies of ancient proteins from Turkana will be able to solve some evolutionary mysteries, such as the origins of hippos. He and his colleagues also hope that ancient proteins can be obtained from early hominin remains found in Turkana Basin. 'Being able to show that we can get back to 18 million years in this kind of really hot, harsh environment, really shows that the world is open for working on palaeoproteomics,' says Timothy Cleland, a physical scientist at the Smithsonian Museum Science Conservation Institute in Suitland, Maryland, who co-led the Turkana study. He's especially interested in trying to get proteins out of the teeth of dinosaurs, but that will be a challenge, because their enamel is especially thin, he says. The studies are a major technical achievement, says Deng Tao, a palaeontologist at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. But as researchers look even further back in time for ancient proteins, he hopes the results will be able to support meaningful insights into the history of life, 'rather than just a competitive pursuit of the oldest records'. Although the studies focus on evolutionary relationships, Collins is more excited about the prospects of gathering other insights from ancient proteins, including data on biological sex — based on the potential presence of types of enamel protein that are found only in animals with Y chromosomes — and information about where an animal sits in the food chain, written in nitrogen isotopes in amino acids, he says. 'What can you do with it? Everything. It's like, wow!'
