JackWisps
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- Posted: Wed, 01 Jul 2009 09:59:51 +0000
Golden Dysprosium
The problem comes down to basic word association: when you think of aliens, you automatically think of some fantastic creature, advanced far beyond us that you saw in some movie or t.v show.
well they would have to be advanced far beyond (or at least a few good steps (fuel, food, etc for extended travel)) us in order to survive the travel between solar systems. That or floating around in a large space station like thing with fuel tanks strapped to them (solar power wouldn't work well too far from a star). Their brains/personalities/bodies may not be any more advanced than ours, but their technology almost certainly would be.
Golden Dysprosium
The thing is, every planet had roughly the same starting point in time, so it's unlikely they're any further ahead than us. Hell, look at how many screw ups we've made just with orbiting spacestations, let alone intergalactic travel.
sort of, but not really. saying the universe started 14B years ago (not exact but work with it), there was a 300k year time before stars/galaxies and all could form (or was that just matter... I forget my astonomy course lol), and the stars that did would be pure H/He (maybe some Li). Those stars would likely be large and have quick lives because of it, but they would produce the required elements for life (carbon, iron, calcium, etc). Seeing that a star would need many million years to run its life, in any case, let's give a full billion to the first generation of stars (and whatever I may have forgotten). That is well more than a very large star would need to run its life, but a few cycles may be required for enough higher elements (iron, carbon, etc)
So now it is 13B years ago. Following what we can gather that happened here (on Earth), it would take about 5B years from the solar accretion disk beginning to collapse to sentient life. While it is possible for it to emerge sooner, or later, we know it can be done in that amount of time so it is a good starting point. However, if you look at how far we are into the age of the universe, we are only at 6B years! That is 8B years ago that a species could have potentially reached our stage of technology (give or take a million or even billion years it makes no difference to my point)!
Even if you assume that a civilization were to start at the exact time as ours, it is completely possible they skipped things like the dark ages, or that they worked together better, so less/no wars, which would speed them along even faster. Combine that with the rate of technological change has been growing since we to this stage, then you should realize that is is completely possible for an alien group to be far, far ahead of us technologically, and as much as we screw up we did manage to go from thinking flying was impossible to the moon in under 100 years(~66 actually). It is quite believable that a civilization that focused on it more (we don't any more), and with one of the many potential head starts they could grab on us, finds space travel no real problem any more.