01/07/2009 (7:06 am)
Filed under: nappedeptrole.com edit
Scientists always state that planets and some natural satellites have metallic cores, but how do they know that? I mean, they say that earth has a solid iron core and a liquid metallic outer core, and ganymede has a liquid iron core...but how do they know that if they've never actually observed it?they send waves through the planet's core, and receive it
on the other side of the planet, and measure the time
it took the wave to travel that distance.
since waves travel faster in a denser matter, with the distance
that the wave traveled, they can calculate the density
of the material the wave traveled through. And for example,
the waves that traveled through the Earth are timed, and
the density of the matter inside is approximately the density
of liquid iron!Scientists study the s and p waves from earthquakes. These waves travel differently through the earth. This website explains it well:
http://www.seismo.unr.edu/ftp/pub/louie/...it's actually a prediction...it's kinda like feeling in a dark room for an object... you can feel it, you can smell it.. but you never know what it ACTUALLY is... They know, because in the periodic table, and in the very beginning of time, a hydrogen atom smashed into another hydrogen atom to make helium..and then a helium smashed into a hydrogen to make lithium.. and so on. when planets were formed......it somehow it's like that..
I FORGOT ...i learned it in grade 9 science class.. on the solar system or something....
unless your question misleaded me to something else, but this is a startScientists study meteorites, which came from a planet (presumably where the asteroid belt now lies) that was similar to the Earth. Some of these meteorites are stony (like the Earth's mantle) and others are iron-nickel alloys (like the Earth's core). Also, by knowing the density of the Earth as a whole, and the densities of the crust and mantle, they can deduce the density of the core. This density matches that of the calculated density of an iron-nickle alloy under calculated pressure/temperature conditions at the core. The fact that the Earth also has a magnetic field points to iron in the core.In the interest of being a little bit punchy tonight - scientists genetically alter a species of woodchuck to withstand the intense pressure and heat from the center of the earth. This mutant gnaws its way down with a little chemistry lab on it's back and a camera sending images - when it gets there - it performs experiments and transmits morse code back to the surface.
As for the other celestial objects in the solar system - the aliens told them so - they taught earthlings how to genetically alter our woodchucks.
:~)
Have a great night - and thanks for the opportunity to come up with a ludicrous answer!#If you have any other info about this subject , Please add it free.# |
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