Of course. As there are in any other speculation about finding live ETs. We don't have a good model. By analogy, if you could drop a modern human explorer on E

Of course. As there are in any other speculation about finding live ETs. We don't have a good model. By analogy, if you could drop a modern human explorer on Earth at a uniformly selected random time in its history up 'till now, at a random spot it would almost always be uninhabitable. http://www.antipope.org/charlie/blog-static/2009/10/how-habitable-is-the-earth.html http://www.antipope.org/charlie/blog-static/2009/10/how-habi... Time is really, really long, and we're biased not to recognize that, especially when it opposes our "space is big" arguments.