“ Hydrocarbon lakes *One of Mars's moons, for example, has a lake of liquid hydrocarbons, such as methane, rather than liquid water.* Titan, one of... (read full comment) ” 

Posted on March 12, 2009 at 6:23 AM EDT

“ Where Are They? Advanced civilisations will be capable of great subtlety, and there's no reason why they couldn't explore the whole galaxy without... (read full comment) ” 

Posted on April 29, 2008 at 1:35 AM EDT