Reuters: Science News: "Tens of billions" of habitable worlds in Milky Way

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"Tens of billions" of habitable worlds in Milky Way Mar 28th 2012, 10:14 Tweet Share this Email Print Related News U.S., EU, Japan take on China at WTO over rare earths Tue, Mar 13 2012 Strong solar storm heading for Earth Wed, Mar 7 2012 UK scientists to help satellites dodge sun storms Fri, Mar 2 2012 This artist's impression shows a sunset seen from the super-Earth Gliese 667 Cc. Credit: Reuters/ESO/L. Calçada/Handout By Ben Hirschler LONDON | Wed Mar 28, 2012 6:14am EDT LONDON (Reuters) - Astronomers hunting for rocky planets with the right temperature to support life estimate there may be tens of billions of them in our galaxy alone. A European team said on Wednesday that about 40 percent of red dwarf stars - the most common type in the Milky Way - have a so-called "super-Earth" planet orbiting in a habitable zone that would allow water to flow on the surface. Since there are around 160 billion red dwarfs in the Milky Way, the number of worlds that are potentially warm enough and wet enough to support life is enormous. Xavier Bonfils of the Institute of Planetology and Astrophysics in Grenoble, the leader of the team, said the 40 percent figure was at the high end of what had been expected and the finding underscored the prevalence of small rocky planets. His team is the first to calculate the number of super-Earths - planets with a mass between one and 10 times the Earth - in such habitable zones, although previous research has found the Milky Way to be awash with planets. Red dwarfs, which are faint and cool compared to the Sun, account for around 80 percent of the stars in the Milky Way. After studying 102 of these stars in the southern skies using a European Southern Observatory telescope in Chile, Bonfils and colleagues found rocky planets were far more common than massive gas giants like Jupiter and Saturn in our solar system. However, the rocky worlds spinning around red dwarfs are not necessarily cosy places for alien forms of life. Because reds dwarfs are much cooler than the sun, any planets with liquid water will need to be orbiting much closer to the star than the Earth is from the Sun. That may mean they are bathed in damaging X-ray and ultraviolet radiation. Scientists aim to take a closer look at some of the Earth-like planets as they pass in front of nearby red dwarfs, which should yield information about their atmospheres and help in the search for possible signs of life. The research was presented in a paper to be published in the journal Astronomy & Astrophysics link.reuters.com/bav37s (Editing by Michael Roddy) Tweet this Link this Share this Digg this Email Reprints We welcome comments that advance the story through relevant opinion, anecdotes, links and data. If you see a comment that you believe is irrelevant or inappropriate, you can flag it to our editors by using the report abuse links. Views expressed in the comments do not represent those of Reuters. For more information on our comment policy, see http://blogs.reuters.com/fulldisclosure/2010/09/27/toward-a-more-thoughtful-conversation-on-stories/ Comments (0) Be the first to comment on reuters.com. Add yours using the box above.

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