by Sixstrings » Fri 24 Oct 2014, 14:03:25
Alright, well back to the thread topic.
Regarding warp travel -- faster than light -- even I think that's far fetched, and I didn't realize this but apparently NASA is working on it and a scientist has a developed a theory and concept and NASA and DARPA and are throwing a little money at it. Warp travel would get a ship to Alpha Centauri in two weeks.



$this->bbcode_second_pass_quote('', 'T')he IXS Enterprise is the name of a conceptual superluminal spacecraft designed by NASA scientist Dr. Harold White, revealed at SpaceVision 2013, designed for the goal of achieving warp travel. The conceptual spacecraft would be a modified version of the Alcubierre drive. Dr. White is currently running the White–Juday warp-field interferometer experiment in order to develop a proof of concept for Alcubierre-style warp travel, if possible.
http://en.wikipedia.org/wiki/IXS_Enterprise$this->bbcode_second_pass_quote('', 'T')he Alcubierre drive or Alcubierre metric (referring to metric tensor) is a speculative idea based on a solution of Einstein's field equations in general relativity as proposed by theoretical physicist Miguel Alcubierre, by which a spacecraft could achieve faster-than-light travel if a configurable energy-density field lower than that of vacuum (i.e. negative mass) could be created. Rather than exceeding the speed of light within its local frame of reference, a spacecraft would traverse distances by contracting space in front of it and expanding space behind it, resulting in effective faster-than-light travel.
Objects cannot accelerate to the speed of light within normal spacetime; instead, the Alcubierre drive shifts space around an object so that the object would arrive at its destination faster than light would in normal space.[1] Although the metric proposed by Alcubierre is mathematically valid in that it is consistent with the Einstein field equations, it may not be physically meaningful or indicate that such a drive could be constructed.
The proposed mechanism of the Alcubierre drive implies a negative energy density and therefore requires exotic matter, so if exotic matter with the correct properties does not exist then it could not be constructed. However, at the close of his original paper[2] Alcubierre argued (following an argument developed by physicists analyzing traversable wormholes[3][4]) that the Casimir vacuum between parallel plates could fulfill the negative-energy requirement for the Alcubierre drive.
Another possible issue is that although the Alcubierre metric is consistent with general relativity, general relativity does not incorporate quantum mechanics, and some physicists have presented arguments to suggest that a theory of quantum gravity, which incorporates both theories, would eliminate those solutions in general relativity that allow for backwards time travel (see the chronology protection conjecture), of which the Alcubierre drive is one.
http://en.wikipedia.org/wiki/Alcubierre_drive You know, it was just in the 1980s and early 90s that quantum computers were something not even science fiction had ever imagined. Quantum is insane -- things are true and false, they are in all places at once, and in computing it means that all possible solutions can be seen at the same time, instantly.
And it's not fantasy, it's real, and quantum computers are really good at certain things like encryption and breaking encryption. And we're just at the dawn of that computing age, the quantum age -- think about that for a second. Todays quantum computers are like those first computers back in the 1950s with vacuum tubes that filled a whole building up. And now you have more power in your google glasses.
Getting off topic on computing, but my hunch says quantum mechanics are the key to a lot of things, including faster than light travel. I don't know anything about "quantum gravity" though, and how that works.
I admit I get a little foggy on these details, I'm not a physicist, but it's fascinating. For example, did you know that at the quantum level (what is it, quarks?) you can take the smallest parts of an atom and separate them and have one at one end of the universe and the other at the other end. And then if you do something to one of the quarks or whatever, the other one -- all that distance away -- responds. It's really astounding, it suggests a framework and all things being connected; a lot like buddhist thought.
Getting back to what's more possible in the nearer term, you know, we had the technology back in the 1960s and 1970s that could have got a little station up on Europa. Look at all the Apolla program accomplished. None of that tech existed before they set out to make it for the first time.
The Saturn V is still the largest rocket that was ever made.
That was fifty years ago. They didn't even have decent computers.
Even the space shuttle had crappy 1970s computers. A smartphone has more processing power than the shuttle did, lol right? Turns out you can conquer space with just vacuum tubes and switches and electrical and rocket plumbing.
So look at all we have now -- and 3d printers on the horizon, and new engines on the way. New concepts like inflatable modules.
Getting to Mars and Europa around Jupiter is still old school rocketry though -- you don't even need a Saturn V, you could use small rockets and assemble the vehicle in space.
The Falcon Heavy that spacex is working on will be a cheap delivery system to Mars, biggest rocket since the Saturn V. So NASA -- or private interests -- will be able to do more, with the smaller budgets it has now, and that's thanks to Elon Musk.
Anyhow, I really don't find Mars too interesting. Europa is where it's at -- it's got a liquid water ocean with more water than on all the Earth. It has geo energy, and geothermal vents.
(edit: correction about radiation, europa has a lot of radiation hitting it when it passes out of Jupiter's magnetotail. Radiation shielding could be used, or underwater habitats and the ice cap protects from radiation.)
You guys don't find that interesting? That there's a moon just a couple years travel away that has an ocean? And may very well be crawling with life? On earth, we know that -- where there is water and thermal vents and energy, there is life.