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Everything posted by Guest_Jim*

  1. I'm prettier sure that the current figure for the size of the universe is 156,000,000,000 light years across, still quite a growth spurt.
  2. Aside from this one, I frequent http://forum.worldwindcentral.com/. This forum is for a NASA program named World Wind. Think Google Earth but with a scientific purpose, far more imagery, far more add-ons (well over 200, and all but three are free), and more than just Earth. Currently it has the Earth, the Moon, Mars, Venus, Jupiter, and imagery from the Sloan Digital Sky Survey included in the installer. Also the World Wind forums actually has more members than this one.
  3. The Hubble Constant is the rate of expansion for the universe and according to a new study maybe off by as much as 15%. This may not seem that big of a deal but it is since this is needed to estimate the size and age of the universe. Here's a link to a podcast about it that has links to more information. http://hubblesite.org/explore_astronomy/skywatch/#66
  4. Perhaps the accretion disk around the black hole has a charge that can be detected. What I find odd is how can something that dense can have a difference in charge from side to another. Unless of course it's like an atom where some of the mass with one charge orbits the rest of the mass which has a different charge. In any case they just do and I don't think I've ever seen a reason why they have a charge, unless it's caused by spinning. Neutron stars actually do have charges, because if one has a strong enough magnetic field light will only escape from the poles. If such a neutron star spins you get a pulsar. (I really hope I'm remembering this correctly.)
  5. I actually have a 1927 physics book and boy is interesting to read. It describes everything with examples of how it was done/measured/applied etc.. I've actually learned a lot from it, for instance, how absolute zero was calculated to be -273.15 degrees Celsius. What else is really interesting is how when it refers to protons as "positive electrons" and that "Einstein has recently suggested, however, that matter and energy may be interconvertible, and there is some evidence in favor of this view." This textbook conveys so much information but in very simple language so anyone can understand it. As far as what past civilizations had I suggest that, if you have the History Channel, watch Engineering an Empire on Mondays at 9 p.m. est. This may seem just like a commercial for the show but I'm serious it is very interesting, they talk about how certain buildings were built, weapons of war, whatever is a symbol for that civilization or was invented by them.
  6. There is a satelitte that measures the gravity of the Earth. Here's it site http://www.csr.utexas.edu/grace/
  7. Hydrogen isn't the only fuel that could be used in fuel cells, I've also read about methanol fuel cells. A methanol fuel cell works like a hydrogen fuel, but carbon dioxide is also produced. However methanol is a lot safer to transport than hydrogen, since it is a liquid at room temperature, so for cars it would probably be a better choice at the moment, in my opinion.
  8. You couldn't use any thing like that because it sounds like this is not suppose to be known of by the public and that large of a mass would affect Mars's orbit giving it a wobble as it orbits Mars, which could be noticed by people.
  9. Ecoli you do realize that the latin in your signature is incorrect. Ubi means where as in a place not wear as in wearing clothing. I think you want "semper geris interulam."
  10. I found away to stop it. If you save the file with whatever phrase you want, save it, reopen it, and it will create those boxes, but try putting the same phrase in again and save it as the same file. When you open it next the text is correct. I don't know why this works but it does at least on my computer.
  11. There's a company out there that uses laser to put holograms on a medium to store data, which sounds similar to what that resin is used for but it isn't just the top layers of the medium being used. Here is a link to that company's website. http://www.inphase-technologies.com/index.html
  12. Here is a link to a page on the AMD website that lists some majors that would be useful if you want to work there. http://www.amd.com/us-en/Corporate/Careers/0,,51_82_621_4235,00.html
  13. Twobeds works well for me, but Vidahost might work better. The same people run both of these but Twobeds is free and has a limit of 50MB with unlimited bandwidth. It also says to try Vidahost hosting for proper PHP. Hope this can help.
  14. Source code editor (Notepad ++) http://notepad-plus.sourceforge.net/uk/site.htm Windows install file creator (Nullsoft Scriptable Install System(NSIS)) http://nsis.sourceforge.net/Main_Page 3D geospatial visualization platform (NASA World Wind) http://worldwind.arc.nasa.gov Virtual microscope http://virtual.itg.uiuc.edu/index.shtml Graphing program that works with the blind (MathTrax http://learn.arc.nasa.gov/mathtrax/index.html Not only are all these programs free but they are open-source as well.
  15. Perhaps a student oriented version with simpler posts could work, I doubt a sixth grader would understand topics like "Aren't exploding black holes negentropic?," but I would bet that some would be interested in finding out what that means. If this were to be done though people would have to post new topics that are simple but would also succeed in interesting kids in them.
  16. Guest_Jim*

    Water Fuel

    I'm pretty sure that what lethalfang was trying to point out is that in chemical processes however much energy there is before you start, whether it's in bonds or heat, is how much there will be when you stop. Since water is simplest thing hydrogen and oxygen can make it would therefore take energy to force it to be come something else, so the only energy you'd get back is what you put in if the end product is water. Imagine a car that can make gasoline by going in reverse, have it go from point A to point B then back to point A in reverse using the same path. The end result is nothing has been gained, nothing has been lost, and nothing has happened.
  17. We already have multi-touch screens which create interesting possibilities. Multi-Touch Interaction Research
  18. Here's a nice graphing program called MathTrax and it's designed so that even blind people can use it, provided they can use a keyboard. http://prime.jsc.nasa.gov/mathtrax/INFO/news.htm
  19. Here's something that other students, and some teachers, at my school like. It's called World Wind and is made by NASA. It's a free open-source 3D globe program with a great many of scientific uses. It comes with six different worlds, the Earth, the Moon, Mars, Venus, Jupiter, and the Sloan Digital Sky Survey imagery. Here's World Wind's homepage http://worldwind.arc.nasa.gov/ Here are the forums http://forum.worldwindcentral.com/ Here is a list of some of the add-ons. http://www.worldwindcentral.com/wiki/Category:Add-ons If you prefer biology then you might like The Virtual Microscope. This too is free and open-source and lets you examine a great deal of things under either virtual light microscopes of scanning electron microscopes. Here is the link to where you can get this http://virtual.itg.uiuc.edu/index.shtml
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