posted on Sep, 1 2011 @ 02:30 PM
having watch the entire episode (and a better one from horizon on telescopes) i can say that actually very little about the actual inner core is
really got into.
The scientist ususes two diamonds to hold a shard of the alloy "sceince belives the inner core is most likly to be made from (aka iron-nickle
alloy)" which he then compressed with a vice like device to 3 million psi, he then puts the device in a very high powered infrared laser from a
syncrotron installation, and heats the alloy to 4k kelvin thus simulating the inner core inviroment, then obverses the data.
Long story short this extremely high pressure metal alloy, which is crystaline in atomic sizes, moltern and liquid at high temprature, once again
takes a crystaline form once the temprature and pressure are increased futher.
This means that the solid inner core is made up of these crystal structures like trees in a forest, projecting into the liquid outter/inner core.
The first 30 mins of the documentary was about how the sceintists found out the inner core is solid and not all liquid. Looking at wolrd data from
seismographs, scientists noticed a slowed responce in waves, a shadow of slowed weaves about the size of the moon at the core from the oposite side of
the world during an eather quake there. Using what they know about speeds of waves through rock, magma and liquid metal, they determined the inner
most be more solid, which led to the experiment above.
I hope that fills you guys not in the UK in ok.