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Originally posted by Beachcoma
I think what it really means is the core is a sphere comprised of iron cubes. The graphics on the source article really threw me off.
Maybe this is a better representation according to this theoretical model:
LEGO Sphere
.
Originally posted by Hal9000
reply to post by juggaloco
Yes there is a way to tell what is deep inside the Earth. Scientists can analyze the structure by determining how earthquake waves propagate through the mantle, as nzldude started to tell us about. To get an idea what he means the graphic from Wikipedia shows a simplified diagram.
From Wikipedia article: Structure of the Earth
I read a little about this in some FOIA documents about analyzing earthquake data in different parts of the World and how they had the capability to determine if a seismic event was natural or from some underground nuclear test. There is no direct method of telling what is under our feet, but one thing is conclusive. The core is spherical and it is certainly not hollow.
Originally posted by bigfatfurrytexan
Hal, i have asked you for input on the same subject once or twice. In case you missed it, scroll up.
Originally posted by bigfatfurrytexan
Hal, very good post. However, i would once again posit that when you change scale you change properties. For example, consider the emerging world of plasmonics on the nanoscale.
Further, without knowing the true make up of our core (everything thus far is only a postulate) we can only guess at what its properties may be.
As you know collective oscillations of free electrons are the interaction of light with surface plasmons. Photonics is the study of the application f light. in many wy & ue the tw are intertwined. photonics is further along in the real world. Several thousand centers worldwide are involved in it. Oddly the literature is just beginning to be produced in earnest. Photonics is being used in cameras, mobile phone cameras, lasers to increase LED efficiency, making optical data work better, broadband mirrors, disk laser fibers, optical tweezors(probably commercially in future 2 to 10 yrs), and the list goes on & on.
Many claim photonics will have the impact on society that electronics has. Medicine is one area it will potentially change our lives, imaging of geophysical data and in computing. So within your field of communications we can rest assured photonics should play a big role. Of course you know all about the photovoltaic cells and hydrogen applications.
Since we look to future I think optical tweezors wil be a big aspect. These will aid medicine as welll as materials science and even chemistry. The tweezors are capable of trapping an object by using focused light beams. This will allow particles to be trapped in 3-d. Here we have two conditions...radiation pressure and the other is gradient pressure. It will enable light to not only trap but also move things from nanometer to micrometer scale. Once again as you read me expound on...we are talikng the weird area between classical and quantum worlds.
In medicine the focus is on biophotonics. This will include both imaging and treatment. One big move that's successful is two-photon photochemistry in treatment of eye problems. This involves a lot of UV manipuation and the such. The ability to focus the light beyond healthy tissue to diseased membranes and cells is a good thing.