Back in this post, I wrote about some realistic factors to consider if you ever wanted to be able to gain the power of self-propelled flight. I fear that this post may have dashed the hopes of many aspiring Superman wannabes. In the post below, I approach the idea of living on other planets in the same way. If you hope to do this someday, you may not want to continue reading. You have been warned.
All my life, I've loved science fiction. From the first day I watched The Black Hole, until the latest episode of Battlestar Galactica which I watched over the weekend, sci-fi has offered me so much that real life could not: New, innovative concepts for aliens, cool-looking robots, and the possibility of life on other planets.
Finding planets teeming with life, or at least holding the possibility of life, happens fairly regularly in the sci-fi world. Every second week (when they weren't dealing with "subspace anomalies") the crew of Star Trek: The Next Generation found another "M-class world" with the same atmosphere as earth. Battlestar Galactica features humans who left one planet to colonize 13 others, including Earth itself. Star Wars offers planets that may be entirely composed of ice, desert, or swamp, but there's still life to be found on each one.
In real life, however, life-supporting planets have been very rare. In fact "completely undiscovered" is probably the best term. There is no other planet in our solar system which could support human life without some serious planetary renovations first. In fact, it's conspicuously odd that the Earth should be so overflowing with life (micro and macroscopic, on land, in saltwater, and freshwater, and present at Earth's temperature extremes, and at every degree in-between), and that every other planet we've come in contact with is so completely inhospitable to life.
The fact is, there are many variables involved in finding a planet that could support life (or earthly life, at least). It has to be a certain distance from its sun in order to regulate planetary temperature, allowing water to exist in that narrow temperature band (0-100 degrees centigrade) where it can be found in liquid form. I has to have a sun that produces sufficient heat (not too much or too little) without major fluctuations in order to keep planetary temperatures stable. It has to have breathable atmosphere, with precise ratios of oxygen in relation to other elements, which can also filter out dangerous radiation from the sun and retain necessary surface heat.
The planet would have to rotate at a certain speed on a precisely-aligned axis, so that no one area of it would be over or under-exposed to solar effects. It would have to be of a particular size, so that it would not have too much or too little gravity. It would need to contain all of the components necessary for the composition of organic life, in precise ratios, and in symbiotic relationship to everything else, in order to develop into mutually-beneficial ecosystems. You can insert the creation/evolution debate here, if you like.
All of this is to say that even if you did find another planet in the universe that could support human life, it would be impossible to find another planet in the same solar system that would meet the same criteria (i.e. Battlestar Galactica's 12 colonies). And the odds of finding two earth-like planets in one person's lifetime of space-travel would be far more unlikely than Star Trek would have us believe.
Not that space travel would ever be feasible anyway (see this post for more on that subject). My point is that earth-like planets in science fiction are very much stretching the limits of fiction. Which is what science fiction is supposed to do anyway, I suppose. However, mark these words: Next time someone "discovers" an earth-like planet on a sci-fi show or movie, you will remember this post. And in this way, DarrenConley.com will forever be part of your future sci-fi experiences. Sorry.
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I believe I mentioned in 
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