Well for one let me say that it really isnt that difficult to create the building blocks of life. Aminoacids and peptides can be created by simple things like meteor impacts and such (the simple act of the impact). And, in fact, the odds are pretty good that one day we will discover life here in our own solar system. Many of the moons of the larger planets lay unexplored and very much DO contain the conditions to create and support forms of life. Hell under the surface ice of Europa is believed to be a liquid ocean, just imagine the abundance of life that could be sustained.
Life, even on Earth, can and has existed in regions and circumstances that people would never imagine anything could live through. Some of these places, for example: Near active volcanic vents at the bottom of the ocean. Some of these microbes reproduce BEST at temperatures over 200 degrees F. and live in waters smothered in sulfur and other elements/chemicals that are dangerous/deadly to other forms of life. Microbes have even been proven to survive SPACE EXPOSURE (meaning not only sub-freezing, extremely cold temperatures, but also constant solar radiation bombardment, and not to mention lack of atmosphere, over YEARS, not just minutes.. YEARS). Scientists have also discovered microbes that live deep deep deep inside the earth in small pockets of water that have remained undisturbed for tens of thousands, if not hundreds of thousands, of years. These microbes gather enough energy to reporoduce once every FEW THOUSAND YEARS. Imagine living that long just to reproduce once.
Life is also very good at surviving. Imagine what life on Earth had to deal with when coming into existance. At that time the earth was under constant bombardment form space rocks, constant volcanic activity, radically fluctuating temperatures and environmental conditions, and god only knows what else.
The building blocks of life are EVERYWHERE. To think that they are confined to one tiny speck in the massive universe is naive.
We, as humans, also missed out on BILLIONS of years of the past. Billions of years where many civilizations could have sprung up on other planets, done this that and the other, and died out. Billions of years where life could have stewed on other plenets, even in or very own solar system, and could simply no longer be supported and died out. Just look at Mars. A few million years ago there was/could have been giant oceans, just like here on Earth. It's hard to support ocean life, however, if that ocean dries up. Some life forms may be left on Mars even today, but we'll never know until we get a good look. And that goes for the rest of the planets and moons in our own back yard.
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We Must Dissent.
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