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    andytak3740 reacted to GAHD in Magnetic Field Line Rockets/jets   
    This one's feasible, but not really practical. I seem to remember a theoretical magnetic engine for long term study of Jupiter or Saturn, but IIRC it's theoretical.
    They'd need to be on the order of tesla(unit) to be useful IIRC. So, no not really. Think of why piercings aren't allowed near MRI.
  2. Like
    andytak3740 got a reaction from SaxonViolence in Feasibility Of Floating Plants?   
    I see. I am in the midst of writing a fictional novel, and I am attempting to keep everything grounded in reality. At least have every fantastical aspect be feasible in our life if we were to somehow replicate it. An idea that came to mind revolved around massive forests that stretched into the heavens. The idea revolved around a terrestrial seaweed like plant evolving to have air-sacks that could supports its wait past the gravitational weight limit. It appears that hydrogen could work as a solution, now as to the implications I suppose. But are there other factors that I could be missing? I do appreciate the information you provide when it relates to the plants being both a hazard as well as a potential resource. 
    Thank you for the post.
  3. Like
    andytak3740 reacted to GAHD in Best Way To Hire A Science Consultants?   
    Depends entirely on how much you're willing to pay i'd think. Leaving letters with faculty and grad students at your local Universities seems like a good start. I knew a few grad students who would talk for a cheeseburger to get off the ramen noodle diet...
  4. Like
    andytak3740 reacted to OceanBreeze in Feasibility Of Floating Plants?   
    I have mixed feelings about those large kelp. They can be both annoying and dangerous, as they tend to get tangled up in everything from lines and nets to propellers and unfortunately even scuba divers, and there have been some fatal accidents.
    That said kelp is very interesting and worthy of study. Kelp farmers say it will eventually feed the world.
    Getting back to the topic, I thought I would mention that the “air bags”, the pneumatocysts, are actually filled with carbon monoxide, CO.

    CO is very marginally lighter than air but as exchemist said, you would need to fill the bags with something very much lighter to provide any significant lift to a terrestrial plant.
  5. Like
    andytak3740 reacted to exchemist in Feasibility Of Floating Plants?   
    It would need to be a gas lighter than air, so not oxygen (molecular weight 32)  or nitrogen (molecular weight 28). Methane (molecular weight 16) would not give much lift either. Hydrogen (molecular weight 2) would be the best bet. It is possible to generate this organically (some gut bacteria do this, for example).  
    I remember a Robert Heinlein story called "Starman Jones"  in which there were sort of jellyfish-like creatures that floated in the air like airships or helium balloons, using buoyancy from a gas bladder.
    Maybe one could pursue the jellyfish analogy further and have buoyant "polyps" rising up from the ground, from the top of which "jellyfish" could bud off and float away, as jellyfish actually do in the sea. Creepy! 
  6. Like
    andytak3740 reacted to fahrquad in How Would Life Be Altered If Our Moon Had Its Own Moon?   
    Considering the strong gravitational interaction between the Earth and the Moon it is highly unlikely that a natural object could be in a stable orbit around the moon.  As an alternate though exercise, consider what life on Earth would be like without  moon.
  7. Like
    andytak3740 reacted to fahrquad in What If The Meteor That Killed The Dinosaurs Shattered Before Impact?   
    Gravity from the moon or Mars would be too weak to cause fragmentation of the impactor so the only likely culprit in that scenario would be Jupiter, if you recall the impact of comet Shoemaker-Levy.  Such an encounter would likely have a shotgun effect with most if not all of the smaller fragments missing the Earth.  Although there have been unsubstantiated reports of plesiosaur-like creatures in Loch Ness and the Chesapeake Bay, no dinosaurs are known to have survived except for birds. 

  8. Like
    andytak3740 reacted to fahrquad in What If The Meteor That Killed The Dinosaurs Shattered Before Impact?   
    Here is an animation of the movement of land masses over the last 540 million years.
  9. Like
    andytak3740 reacted to fahrquad in What If The Meteor That Killed The Dinosaurs Shattered Before Impact?   
    The Chicxulub impactor that struck the Yucatan Peninsula nearly 66 million years ago is currently believed to have been either an asteroid or a cometary fragment (which is new to me).  Estimates are that the object was about 6 miles long.  I don't believe that gravity or air resistance would have caused the impactor to break up, or if it did it would have made no difference that close to the surface.  Rock in the immediate area was vaporized, and the underlying geological strata was fractured for hundreds of miles.  This is why there is no surface water and the only fresh water is located in underground Cenotes.  Dinosaurs did survive, although these days we know them as birds (I'll have a dinosaur and swiss on whole wheat, hold the mayo).  I know we discussed this at great length several months ago on another thread, but I can't find it at the moment.

  10. Like
    andytak3740 reacted to exchemist in Ionic Fluid Tubing Vs Electrical Wiring In A Tesla   
    It will not be very effective. In the conduction band of a metal you have an effectively unlimited number of charge carriers (electrons) that experience low resistance to motion through it. An ionic solution requires the physical diffusion of relatively large charge carriers (whole atoms rather than electrons)  through a solvent.  For example sea water has a specific conductance about a millionth of that of copper.
    I'm not saying you could not do it, but the resistive losses would be high. 
  11. Like
    andytak3740 reacted to GAHD in Why Isn't Concrete Used On Space Stations Or Space Craft   
    I'm not very up-and-up on the Al content of moon dust, but I'm going to say I think you're wrong about the useful properties of concrete-like materials in space or on the moon. For one, sealing could be easily accomplished with a VERY thin layer (or two or three because redundancy) of any non-permeable material on the inside of any such building. For another, aggrigate-in-binder construction(concrete/cement in a very broad view) is a very useful way to "fill out" a shortage of whatever the binder is without sacrificing overall strength; sometimes the end properties of the resultant materiel are quite superior to it's component parts after all.
    I seem to recall in-place construction like that being a big part of several NASA proposals for a moonbase I've seen in the past. I'll see if I can find them when I have time to really dig.
    The prevalence of Fe in untrafine particles in moondust would probably mean that some kind of Vapor-deposition laser-welding(printing) of solid iron could be a good option as well, but even just using that dust in an unrefined state as an aggrigate would yield some very useful properties to a "space concrete".
  12. Like
    andytak3740 reacted to GAHD in Why Isn't Concrete Used On Space Stations Or Space Craft   
    Too expensive to fly it up there. Everything in space has to be as light as possible just because of the massive amount of money it takes to get it up there. I think it works out to around $10 000 per pound? Somewhere in that ballpark.

    A really great business model might be to get something up into LEO that can "catch" the smaller debris and lump it all up to be moved around and make "space concrete" out of it. Save money on all the aggrigates and what not and just need an epoxy binder or some kind of solar welding to make a shell out of the bits. That or mine some of the near-earth asteroids and shift that stuff around to use it. Those kind of situations would be a little more likely to get used.

    Space concrete IS part of some science fictions, but the "rule of cool" generally has things made out of more..."cool" things than plain old silica+binder. Troy Rising has some use of it, if I remember correctly. They quickly move on to Nanotube Carbon Fiber, artificial sapphire, and other "high performance" buzzwordium though.

    So, that's it really: Things Cost Money. Concrete is expensive to get up there. Aluminium, Cromoly, Steel, Titanium, Carbon Fiber, Kevlar, and Plastics just get the job done a few thousand dollars per pound cheaper than silicon and lime.
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