Aliens are likely to be just like us.
Simon Conway Morris, professor of evolutionary paleobiology at Cambridge University believes that Aliens are likely to be greedy, violent and wish to exploit the resources of the planet just like humanity. Our abiding image of Aliens is of little men with big heads and immense eyes, but none the less recognisably like humans. As we believe that water is needed for life and we are looking for life in the ‘goldilocks’ zones around stars where the temperature is not too high and not too cold for life such as evolved on Earth it seems likely that evolution will have made an intelligent species similar to humanity/the-human-race.
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Separate species on Earth have evolved the same solutions - eg seeing, flying, walking on land - when confronted by a common environment.
By looking for life on warm Earth-like planets we anticipate that if life evolves on those planets it will have similar features to what we find on Earth.
Consider DNA seeding by an advanced race.
Consider the possibility that an advanced race seeded it's DNA on many worlds that already had life on them, or even placed life on them, with the intent that one day, beings identical to their own species would evolve. The technology to do that would be about on par with the level of technological advancement required to be a well traveled interstellar race. Perhaps we are just a copy of a truly ancient race, and we will actually find humans on other worlds. Considering the age of the universe, this ought to be seriously considered.
I can't bring myself to open my mind enough to really consider that. Sorry.
there is no evidence that animals other than man are less intelligent
All animals are not greedy , yes we are largely driven by a survival instinct (some males of certain species die to impregnate their female counterparts(black widow spider,bees etc))
but there's self-sacrifice/suicide/the-willingness-to-die. We cannot assume that Intelligent aliens are all greedy and looking for planets to colonize. Or that we are greedy because we want to fill that need of ours.
there's ample evidence.
The point is that there is a distinctly high probability that aliens can be looking for planets to colonize just as we are.
Depends on the time scale and interplanetary networks also in place.
It would depend on how far into their cultural evolution the aliens are by the time they a) developed long haul space flight and b) contacted Earth.
Human psychology has evolved. While we are still mostly selfish and have a tendency towards aggressiveness, we are less superstitious and ignorant, have more contact with outsiders and are more accepting of people different to us than we were thousands of years ago. Many cultures have also been changed dramatically by positive and negative experiences of interaction with other cultures, as well as other violent cataclysms. If the aliens have had thousands of years longer than us to develop, they may have grown out of the need for war, they may already have all the resources they need and are only curious about a species they haven't seen yet. If they already have a stable and thriving interplanetary trade network with other planets, it would only be a mild culture shock to find a new planet, as opposed to humans who have never met any alien species at all. If, in the other extreme, they are a very new culture and have somehow picked up space flight by accident (say, by being physically capable and durable enough to survive travelling under their own power) they won't be advanced enough to plan a large-scale war against us.
They may also have simply evolved on a planet with enough resources and few enough predators, but enough other challenges that they have managed to evolve some problem-solving skills but not an urge towards war.
This also assumes that we humans will be in the same situation by the time we meet aliens. We may be advanced enough to negotiate a peaceful resolution or, at the very least, have advanced enough weapons that we will be secure in our ability to defend ourselves.
An oversimplification of human nature.
To say that humans are 'greedy, violent and wish to exploit the resources of the planet' is a oversimplified impression of humans. Yes, on a global scale, we currently are warlike, greedy and self-destructive. Humans change over time and they would make very different decisions if they weren't under threat, had enough resources etc. When not under stress, humans can think rationally. Not all humans make the decision to go to war and massively exploit the planet, unfortunately they are not in high enough places in authority that they can represent humanity as a whole. Not every situation in which a group of humans has met another group of humans has ended in bloodshed. Humans can also behave massively out of character, go against their own nature, make wildly unexpected decisions - especially if placed in unusual circumstances such as an alien planet. If aliens are really like humans, it means that we really can't predict what they will do.
What do you think?