--- title: Philae Comet Alien Life: Scientists Discredit Report of Life on Comet description: Scientists discredited a presentation by researchers claiming to have discovered signs of microbial life on a comet on Monday. canonical: https://time.com/3947237/philae-microbial-alien-life/ author: Justin Worland article:opinion: false article:content_tier: free article:published_time: 2015-07-06T22:44:28.000Z article:modified_time: 2026-02-22T09:00:08.822Z article:section: Science og:title: Philae Comet Alien Life: Scientists Discredit Report of Life on Comet og:description: Scientists discredited a presentation by researchers claiming to have discovered signs of microbial life on a comet on Monday. og:url: https://time.com/3947237/philae-microbial-alien-life/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt3bd26a2c4c565d5a/698859c60a4a2280bb9c508d/67p-churyumov-gerasimenko.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 1400 og:image:height: 788 og:image:alt: Comet 67P/Churyumov-Gerasimenko is seen in an image made by the Rosetta space probe og:type: article twitter:card: summary_large_image twitter:title: Philae Comet Alien Life: Scientists Discredit Report of Life on Comet twitter:description: Scientists discredited a presentation by researchers claiming to have discovered signs of microbial life on a comet on Monday. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt3bd26a2c4c565d5a/698859c60a4a2280bb9c508d/67p-churyumov-gerasimenko.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Scientists Shoot Down Claim That Alien Life May Be on Comet > Sponsored content. 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ESA/Reuters  by [Justin Worland](https://time.com/author/justin-worland/)  ## Justin Worland Senior Correspondent Jul 6, 2015 10:44 PM UTC Scientists have picked holes in a [widely-reported](http://time.com/3946292/comet-philae-life-microbial-67p-astronomers-alien/) presentation by researchers [claiming microbial life may exist on the comet now home to the Philae lander](http://www.theguardian.com/science/2015/jul/06/philae-comet-could-be-home-to-alien-life-say-top-scientists). The claim originated in a [presentation](https://www.ras.org.uk/news-and-press/2654-do-micro-organisms-explain-features-on-comets) before the Royal Astronomical Society, in which researchers said the makeup of the comet, 67/P Churyumov-Gerasimenko, suggested the presence of living organisms. The scientists argued that data from Rosetta, the European Space Agency probe orbiting the comet, showed the capacity for micro-organisms to eke out life beneath the comet’s black crust. But the findings did not hold up to scientific scrutiny. For example, the researchers suggested that the comet’s deep black crust suggests that it may be partly made of hydrocarbons—the basic molecules of life. That’s a possible explanation, but many black surfaces, like a lava field for instance, don’t necessarily suggest life. Researchers also cited “viral particles” as evidence of life on the comet. It is indeed possible to detect both entire viruses and mere molecular bits of them with the aid of either electron microscopy or RNA analysis. But Rosetta, which is equipped with none of the necessary hardware and never comes within several kilometers of the comet, is not in any way capable of doing that work. None of this says that asteroids and comets aren’t good places to look for life—or at least the precursors. Meteors have already been found to carry amino acids and other building blocks of life. If the chemicals are sealed inside the matrix of the rock in the presence of water, which is entirely plausible, and kept warm by radioactive elements, which could also be on board, there’s no telling what can be cooked up. But, for now at least, the presentation remains unconvincing to the majority of the scientific community. “No scientist active in any of the Rosetta instrument science teams assumes the presence of living micro-organisms beneath the cometary surface crust,” Uwe Meierhenrich, a professor at the Université Nice Sophia Antipolis told the[_Guardian_](http://www.theguardian.com/science/2015/jul/06/philae-comet-could-be-home-to-alien-life-say-top-scientists) by email. _—Additional reporting by Jeffrey Kluger._ ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/3947237/philae-microbial-alien-life/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/3947237/philae-microbial-alien-life/"},"headline":"Scientists Shoot Down Claim That Alien Life May Be on Comet","datePublished":"2015-07-06T22:44:28.000Z","dateModified":"2026-02-22T09:00:08.822Z","description":"The findings did not hold up to scientific scrutiny","url":"https://time.com/3947237/philae-microbial-alien-life/","keywords":["Space"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt3bd26a2c4c565d5a/698859c60a4a2280bb9c508d/67p-churyumov-gerasimenko.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Justin Worland","jobTitle":"Senior Correspondent","url":"https://time.com/author/justin-worland/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt3bd26a2c4c565d5a/698859c60a4a2280bb9c508d/67p-churyumov-gerasimenko.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Comet 67P/Churyumov-Gerasimenko is seen in an image made by the Rosetta space probe","caption":"Comet 67P/Churyumov-Gerasimenko is seen in an image made by the Rosetta space probe","creditText":"ESA/Reuters","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/space/","name":"Space"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/3947237/philae-microbial-alien-life/","name":"Scientists Shoot Down Claim That Alien Life May Be on Comet"}}]}] ```