One of the major fallacies in the article can be found right here: "Heller and Armstrong argue that the longer a planet is inhabited, the more habitable it becomes due to a perpetual increase in biodiversity, so an older planet revolving around an older sun will be a better home for life."

Obviously, Heller and Armstrong have not taken into consideration that Alpha Centauri B b probably had intelligent life. I say "had" because, Alpha Centauri B b, being a much older planet and having a much longer time for developing life, would probably have developed intelligent life that did to their planet what we are doing to earth... poisoning and irradiating it to death. Consider Fukushima, air polution, pesticides and herbicides and fertilizers, plus all the chemical waste dumped into the oceans or buried on land, etc., etc.

No, the intelligent life on Alpha Centauri B b destroyed their planet - and themselves in the process - long ago. What we will find is a desolate world, devoid of life, yet containing many ancient, gigantic cities that are in tragic ruin. In fact, odds are that some of our ancient ancestors here on Earth are remnants of the great civilizations that once flourished on the late great planet Alpha Centauri B b.

Just like many environmentalists on our planet recognize that our planet is dying, that we are killing it, so too some of the people on Alpha Centauri B b must have foreseen the death of their planet. In a last-ditch effort, they transported a number of their people here, simply to save a remnant of their dying race. These Alpha Centauri B b people intermingled with our struggling human evolution, producing things like the sudden advancements found in Egypt thousands of years ago, advancements that built things like the Sphinx and the great pyramids, advancements that appeared seemingly without a source, fully developed, integrating themselves into our lowly, barely-evolved, human society.

How do you like my science fiction? Is it anywhere near as good as that of Heller and Armstrong? I could see some of the contributors to FP taking it and running with it. I always liked a good Sci-Fi story. Let's see how far we can go with it. (chuckle)