By Unknown Lamer from Slashdot's poor-venus department
vinces99 writes with this excerpt from the UW news service: "It might be easier than previously thought for a planet to overheat into the scorchingly uninhabitable 'runaway greenhouse' stage, according to new research (abstract, article paywalled) by astronomers at the University of Washington and the University of Victoria. In the runaway greenhouse stage, a planet absorbs more solar energy than it can give off to retain equilibrium. As a result, the world overheats, boiling its oceans and filling its atmosphere with steam, which leaves the planet glowing-hot and forever uninhabitable, as Venus is now. One estimate of the inner edge of a star's 'habitable zone' is where the runaway greenhouse process begins. The habitable zone is that ring of space around a star that's just right for water to remain in liquid form on an orbiting rocky planet's surface, thus giving life a chance. Revisiting this classic planetary science scenario with new computer modeling, the astronomers found a lower thermal radiation threshold for the runaway greenhouse process, meaning that stage may be easier to initiate."
If correct, the habitable zone shrinks a bit and a few exoplanets might lose their potentially habitable status. And the Earth will leave the habitable zone in a billion and a half or so years as the Sun gets brighter.Read Replies (0)
By samzenpus from Slashdot's read-all-about-it department
benrothke writes "SlideShareis a free web 2.0 based slide hosting service where users can upload presentation-based files. Launched in October 2006, it's considered to be similar to YouTube, but for slideshows. It was originally meant to be used for businesses to share slides among employees more easily, but it has since expanded to also become a host of a large number of slides which are uploaded merely to entertain. SlideShare gets an estimated 58 million unique visitors a month and has about 16 million registered users. With such a strong user base, authors Kit Seeborg and Andrea Meyer write in Present Yourself: Using SlideShare to Grow Your Business how SlideShare users can use the site (including other similar collaborative sites such as Prezi and Scribd) to present their story to a worldwide audience. Given that visual presentations are the new language of business, understanding how to maximize their potential can be a valuable asset for the entrepreneur, job seeker and everyone in between."
Read below for the rest of Ben's review. Present Yourself - Using SlideShare to Grow Your Business
author Kit Seeborg and Andrea Meye
publisher OReilly Media
reviewer Ben Rothke
summary Great resource for maximizing the use of SlideShare and your online presentation presenceRead Replies (0)