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Originally Posted by tore
Well, yes - if you accept that there will be no constraints on what science can do, then your assumption should be valid. If you believe there are limits to what can be achieved, for example faster than light travel, then you have a constraint. If you believe creating a wormholes is practically impossible because it requires just about all the energy in the known universe to create one, then you have another constraint. If you take a picture of a quasar, that picture can show a galaxy which is actually billions of years old. You can almost see the start of our universe up there, that's how relatively slow information travels when distances becomes enormous - yet another constraint.
Based on your assumption, it sounds like we should've been visited by a whole bunch of extraterrestrial species already, but where are they? If we visited a different planet that had primitive intelligent life on it and a wealth of other organisms and resources, do you think we would've just left? I don't think so, I think we would've tried to use those resources for ourselves or, from a more positive perspective, at least nurture those resources. If these aliens visited planet earth, they left no proof behind that we've found like f.ex alien technology. They are not trying to stop us destroying our oasis in space either.
If you say we must have been visited by aliens, you should also come up with some answers to such questions.
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firstly, i'd like to say that although i am indeed no scientist at all, i think it's highly likely that the physical world we seek to describe with the verse of science is much less visible that what the tools of the future will permit us to see. so for the most part, yes, i believe there are nearly zero constraints.
that being said, and to counter your statement concerning the will of aliens to stay or go, i should think they have the tools i speak of, and look at us and see that we are not yet ready to hold them. perhaps a moral binding is held dear and the interruption of Earth is simply non-permissible.
regarding wormholes, i do not really believe anything about them. i believe all the possibilities though, in that i have never had my own wormhole to observe. and besides, if wormholes do in fact exist, and they do in fact require just about all the energy in the known universe to be created, wouldn't i just [I]not[I] be here to speculate?
regarding the speed at which information travels through space and time: you are quite right in saying that we can see the light from many millions of years ago. i must admit that i don't see the relevancy of it. if you are referring to my words about "the exponential growth rate" of information, that's something entirely different, referring only to what can be easily observed here on planet earth, which is the quantity of data we have access to, essentially.
and lastly, regarding physical artifacts left by extra-terrestrials: you should really do some research. i'm not gonna sit here and be the guy who preaches about the things he's seen. but i will say that if you look real hard, you will find something really eye-opening. you might even, if you look hard enough, find official evidence in the form of government documents.