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Originally posted by Sugarpie
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Yeah, but it stands to reason that every planet that has living creatures, only one of those creatures is going to be dominant and capable of space travel, so they are all going to look more or less alike. Just like on earth, se vary, but have the same basic shape and features.
Why would they all look alike? Humans are bipedal because of our environment. And we're fairly abnormal in that trait. It's ...unwise to assume that the entire Universe all developed based upon a handful of principles from one planet. What of planets with increased gravity? They probably use 3-4 or more legs. Or, roll around like an armoured blob. Planets with less gravity or thicker atmospheres? The aliens might float around as a jellyfish or bird.
Why is only one species of alien going to be dominant? What says that aliens have the same motivators and desires as we (as in earth creatures) do? Just because earth is a hostile place and things kill each other doesn't mean that the rest of the Universe traipses about with knives and fanged maws.
Hell, most of the world now doesn't actively seek to kill each other. If another planet, or system, or galaxy or two had a few million or billion years more than us, who knows what levels of cooperation and acceptance the Universe might hold.
Not to patronize you, but the Universe is old. According to the Cosmic Calendar- compressing the history of the Universe down into one Earth year- humans first started painting on rocks and caves and such about 2 minutes before the end of the year.
That's a long time for the rest of the Universe to become more advanced than us.
I mean, we only developed a system of space exploration in the last third of the last second of the year.
They could very easily look upon us and our space system as we look upon chimps and sticks, or perhaps even single-celled organisms and their flagella.