Lucifera wrote:
Wow. Did you write that, Ren? That reads like a proper academic essay (a strange thing to find on a messageboard)! I'm impressed...
Anyway. The idea that space travel is limited to the extent of a planet's natural resources is an interesting one (and, given a moment's thought, probably true). I suppose that, however, given some amount of space travel, it might be possible for humans (or other intelligent beings) to travel to other closeby planets to mine their natural resources and use these to fund further space travel, when their own planet's has been used up - and so, if the Earth was entirely plundered of oil, etc, then Mars, Jupiter, etc, could be next on the agenda.
On second thoughts, though, fossil fuels could be a problem, since natural resources need to be created from compressed dead biological life (ie from the prehistoric era, hence 'fossil fuels') - unless the planet actually had supported biological life at some point, which (given the fact that our solar system at least is entirely lifeless except for the Earth) they wouldn't. Except Mars perhaps - there might have been some life on Mars at some point - probably plants and bacteria (nothing intelligent - but perhaps the right kind of thing to create coal or oil).
However it might be possible that, in the future, different kinds of fuels will be needed to power cars, spaceships, power stations, etc. And that these fuels will be mineable on other planets.
In fact, the search for new sources of fuel and mineral resources will probably be what draws humans out into space travel, if anything. The optimism of space travel as a reach out to meet aliens or god, or whatever, which peaked in the 60s is pretty much gone (now that the reality of the danger and expense of funding space missions has been made well known - e.g. the Apollo disasters). It will be the pessimism of 'the Earth is fucked - there's nothing left, and we can't live here any more', that will motivate space travel, if at all.
In sci-fi novels and films, the idea of mining ships seems to be a enduring one: the Nostradamus in the Alien film is a mining ship and the Red Dwarf in the British sitcom of the same name is also a mining ship, for example. So the idea that one day we will have to look elsewhere for the natural resources is present in fiction at least - so perhaps it will become a reality?
Note: P.S. I neither believe in aliens, nor am I a member of the tinfoil hat brigade - I merely have read/viewed a lot of sci-fi. In the past. I am much cooler now.
I didn't write it, but thanks.
In anycase, you kinda missed the point. Fermi's paradox says that if it were possible for technology to advance to the point to allow interstellar travel we would see evidence that other species have done it.
Quote:
Fermi pointed out that an intelligent species that developed the sort of technology we have today, and kept on progressing, could be expected eventually to work out a way to travel from one star system to another; they would also leave traces that would be detectable from earth. Even if interstellar travel proved to be slow and difficult, a species that developed starflight technology could colonize the entire galaxy in a few tens of millions of years – in other words, in a tiny fraction of the time the galaxy has been around. Given 400 billion chances to evolve a species capable of inventing interstellar travel, and 13 billion years to roll the dice, the chances are dizzyingly high that if it’s possible at all, at least one species would have managed the trick long before we came around, and it’s not much less probable that dozens or hundreds of species could have done it. If that’s the case, Fermi pointed out, where are they? And why haven’t we seen the least trace of their presence anywhere in the night sky?